Eric,
Yes, I am making changes to the same FBX file. I’m saving FBX from Modo to a directory, importing the mesh via “Import” in content browser, making changes later to the exact same file in my 3d package and saving. I’m right clicking on the mesh in the content browser, selecting “reimport”, and receiving the confirmation message "Successfully Imported: “Meshname” Static Mesh from file “Meshname.fbx”.
To be sure this wasn’t an issue with Modo’s changes not saving properly while the mesh is was open in the 3d program I tried saving, closing Modo, and then reopening the FBX in Modo to confirm the changes before reimporting the mesh in UE. Reimport still failed to reflect the changes.
I ran a few tests. This issue persisted in two other projects I have, both in versions 4.6 and 4.7. However, when I saved a mesh to my desktop on my C: drive, the mesh would reimport properly and update changes. I have UE4 installed on my secondary E: drive as well as all of my project folders containing textures and FBX meshes.
I am only having this issue with static meshes, any updates to textures are reflected just fine after reimporting.
To confirm this was an issue with my entire E: drive and not just the directory I usually store my meshes, I also saved to a different location on E: and the reimports still failed.
Hope that helps, thanks for your time.