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UMG UI editor refuses to open

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    UMG UI editor refuses to open

    Suddenly, after saving and re-opening my project, the UMG editor refuses to open.
    It doesn't matter which widget blueprint I click; it just creates an invisible window that doesn't open.
    Here's what it looks like in the task bar:

    Click image for larger version

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    Also, when opening the project, I get the following errors about one of the UI widgets; I don't know if that's related.
    (Also this widget compiled and ran fine before saving, so where does this error come from?)

    Click image for larger version

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    What can I do to make the editor open UMG widgets properly again?

    Btw: I'm using 4.8.3, because 4.9 refuses to build lighting (this is a known bug, apparently, and a bit of a blocker...)

    More information: This also affects a new project; created from template; create new widget blueprint; double-click and it refuses to open (white inactive window visible in the taskbar.)
    So, what kind of editor-level settings have gotten corrupted, and where can I fix them?
    Last edited by jwatte; 09-07-2015, 03:40 PM. Reason: more info

    When I delete AppData\Local\UnrealEngine\4.8, I can now open up freshly blueprint widgets, although I then get a crash as follows:

    Fatal error!

    Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffff

    UE4Editor-CoreUObject.dll!UObjectBaseUtility::IsA() {0x00007ffc673124a4} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor-SlateRHIRenderer.dll!FSlateRHIResourceManager::GetShaderResource() {0x00007ffc5e2c0376} + 56 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor-SlateCore.dll!FSlateElementBatcher::AddBoxElement() {0x00007ffc668f4d5c} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor-SlateCore.dll!FSlateElementBatcher::AddElements() {0x00007ffc668fa9e6} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor-SlateRHIRenderer.dll!FSlateRHIRenderer:rawWindows_Private() {0x00007ffc5e2b3a2d} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor-Slate.dll!FSlateApplication::PrivateDrawWindows() {0x00007ffc5d1f606b} + 116 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor-Slate.dll!FSlateApplication:rawWindows() {0x00007ffc5d1aed40} + 13 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor-Slate.dll!FSlateApplication::Tick() {0x00007ffc5d21727f} + 8 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor.exe!FEngineLoop::Tick() {0x00007ff758384bf6} + 15 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor.exe!GuardedMain() {0x00007ff7583749cc} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor.exe!GuardedMainWrapper() {0x00007ff758374a4a} + 5 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor.exe!WinMain() {0x00007ff7583865c9} + 17 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
    UE4Editor.exe!__tmainCRTStartup() {0x00007ff7583875d9} + 21 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]
    KERNEL32.DLL {0x00007ffc89b22d92} + 0 bytes
    ntdll.dll {0x00007ffc8a419f64} + 0 bytes
    ntdll.dll {0x00007ffc8a419f64} + 0 bytes