Can't set preview mesh in material

Development Rendering
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1

I have a pack from the unreal marketplace “SciFi Weapons Dark” that I bought a while ago. It was added in 4.12, and slowly I moved over to 4.14. I also at some point moved the files around from /SciFiWeapsDark to /Meshes/SciFiWeapsDark. Now, when I try to set the preview mesh in the material for this pack, it doesn’t stick. I noticed that when I open the uasset in notepad++ it shows both of the string assets for the preview mesh. The old one, and the new one, that is. When I restart the editor, the preview mesh gets reset. I don’t really care much about that, but what I do care more about is it clogging up the log file when I go to package my game. I’m pretty sure this is a bug in the editor, I’ve tried everything in my power to fix it but nothing seems to stick.

Windows.EditorPerProjectUserSettings:DetailCategories:Infantry_C.Character Movement: Walking:0 for platform WindowsNoEditor, invalidating cook.
[2017.01.06-04.55.07:730][  0]LogInit:Display: LogLinker:Warning: Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_GrenadeLauncher'
[2017.01.06-04.55.07:740][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to load '/Game/SciFiWeapDark/Weapons/Darkness_GrenadeLauncher': Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_GrenadeLauncher'
[2017.01.06-04.55.07:750][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to find object 'Object /Game/SciFiWeapDark/Weapons/Darkness_GrenadeLauncher.Darkness_GrenadeLauncher'
[2017.01.06-04.55.07:760][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_GrenadeLauncher.Darkness_GrenadeLauncher' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_GrenadeLauncher_Inst.M_GrenadeLauncher_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
[2017.01.06-04.55.07:770][  0]LogInit:Display: LogLinker:Warning: Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_AssaultRifle'
[2017.01.06-04.55.07:780][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to load '/Game/SciFiWeapDark/Weapons/Darkness_AssaultRifle': Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_AssaultRifle'
[2017.01.06-04.55.07:790][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to find object 'Object /Game/SciFiWeapDark/Weapons/Darkness_AssaultRifle.Darkness_AssaultRifle'
[2017.01.06-04.55.07:800][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_AssaultRifle.Darkness_AssaultRifle' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_AssaultRifle_Inst.M_AssaultRifle_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
[2017.01.06-04.55.07:810][  0]LogInit:Display: LogLinker:Warning: Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_RocketLauncher'
[2017.01.06-04.55.07:820][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to load '/Game/SciFiWeapDark/Weapons/Darkness_RocketLauncher': Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_RocketLauncher'
[2017.01.06-04.55.07:830][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to find object 'Object /Game/SciFiWeapDark/Weapons/Darkness_RocketLauncher.Darkness_RocketLauncher'
[2017.01.06-04.55.07:841][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_RocketLauncher.Darkness_RocketLauncher' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_RocketLauncher_Inst.M_RocketLauncher_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
[2017.01.06-04.55.07:850][  0]LogInit:Display: LogLinker:Warning: Can't find file '/Game/SciFi_Weapons/Meshes/St_Shockwave_01'
[2017.01.06-04.55.07:860][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to load '/Game/SciFi_Weapons/Meshes/St_Shockwave_01': Can't find file '/Game/SciFi_Weapons/Meshes/St_Shockwave_01'
[2017.01.06-04.55.07:870][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to find object 'Object /Game/SciFi_Weapons/Meshes/St_Shockwave_01.St_Shockwave_01'
[2017.01.06-04.55.07:880][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFi_Weapons/Meshes/St_Shockwave_01.St_Shockwave_01' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/FX/Materials/M_Shockwave_01.M_Shockwave_01:PreviewMesh')
[2017.01.06-04.55.07:891][  0]LogInit:Display: LogLinker:Warning: Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_Shotgun'
[2017.01.06-04.55.07:901][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to load '/Game/SciFiWeapDark/Weapons/Darkness_Shotgun': Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_Shotgun'
[2017.01.06-04.55.07:911][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to find object 'Object /Game/SciFiWeapDark/Weapons/Darkness_Shotgun.Darkness_Shotgun'
[2017.01.06-04.55.07:921][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_Shotgun.Darkness_Shotgun' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_Shotgun_Inst.M_Shotgun_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
[2017.01.06-04.55.07:931][  0]LogInit:Display: LogLinker:Warning: Can't find file '/Game/SciFi_Weapons/Meshes/St_AssualtRifle_Core_01'
[2017.01.06-04.55.07:941][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to load '/Game/SciFi_Weapons/Meshes/St_AssualtRifle_Core_01': Can't find file '/Game/SciFi_Weapons/Meshes/St_AssualtRifle_Core_01'
[2017.01.06-04.55.07:951][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to find object 'Object /Game/SciFi_Weapons/Meshes/St_AssualtRifle_Core_01.St_AssualtRifle_Core_01'
[2017.01.06-04.55.07:962][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFi_Weapons/Meshes/St_AssualtRifle_Core_01.St_AssualtRifle_Core_01' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/FX/Materials/M_AssualtRifle_Core_01.M_AssualtRifle_Core_01:PreviewMesh')
[2017.01.06-04.55.07:971][  0]LogInit:Display: LogLinker:Warning: Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_SniperRifle'
[2017.01.06-04.55.07:981][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to load '/Game/SciFiWeapDark/Weapons/Darkness_SniperRifle': Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_SniperRifle'
[2017.01.06-04.55.07:991][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to find object 'Object /Game/SciFiWeapDark/Weapons/Darkness_SniperRifle.Darkness_SniperRifle'
[2017.01.06-04.55.08:001][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_SniperRifle.Darkness_SniperRifle' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_SniperRifle_Inst.M_SniperRifle_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
[2017.01.06-04.55.08:012][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_SniperRifle.Darkness_SniperRifle' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_SniperRifleVer2_Inst.M_SniperRifleVer2_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
[2017.01.06-04.55.08:022][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_Shotgun.Darkness_Shotgun' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_ShotgunVer2_Inst.M_ShotgunVer2_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
[2017.01.06-04.55.08:032][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_RocketLauncher.Darkness_RocketLauncher' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_RocketLauncherVer2_Inst.M_RocketLauncherVer2_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
[2017.01.06-04.55.08:042][  0]LogInit:Display: LogLinker:Warning: Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_Pistol'
[2017.01.06-04.55.08:052][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to load '/Game/SciFiWeapDark/Weapons/Darkness_Pistol': Can't find file '/Game/SciFiWeapDark/Weapons/Darkness_Pistol'
[2017.01.06-04.55.08:062][  0]LogInit:Display: LogUObjectGlobals:Warning: Failed to find object 'Object /Game/SciFiWeapDark/Weapons/Darkness_Pistol.Darkness_Pistol'
[2017.01.06-04.55.08:072][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_Pistol.Darkness_Pistol' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_Pistol_Inst.M_Pistol_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
[2017.01.06-04.55.08:082][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_Pistol.Darkness_Pistol' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_PistolVer2_Inst.M_PistolVer2_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
[2017.01.06-04.55.08:092][  0]LogInit:Display: LogRedirectors:Warning: String Asset Reference '/Game/SciFiWeapDark/Weapons/Darkness_GrenadeLauncher.Darkness_GrenadeLauncher' was not found! (Referencer '/Game/Meshes/SciFiWeapDark/Weapons/Materials/M_GrenadeLauncherVer2_Inst.M_GrenadeLauncherVer2_Inst:SceneThumbnailInfoWithPrimitive_0:PreviewMesh')
2

Hey null7238,

Can you reproduce this is a new project with minimal content, and/or can you provide me with steps so I can reproduce the issue on my end?

I would try deleting your Saved, Intermediate, and Config folders from your Unreal Project directory. Be sure to make a copy before you delete those files/folders just in case it causes other things to break.

Let me know if you have further questions.

Thanks,