[4.5 Urgent] Cant upgrade Solus, Making an FCanvas for Render Texture Crashes 4.5, Same Code works great in 4.4

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The crash in CreateCanvasRenderTarget2D comes down to the fact that they changed the way they initialise the FCanvas from 4.4 to 4.5:

FCanvas RenderCanvas( GameThread_GetRenderTargetResource( ), nullptr, FApp::GetCurrentTime( ) - GStartTime, FApp::GetDeltaTime( ), FApp::GetCurrentTime( ) - GStartTime, GetWorld()->FeatureLevel );

Now requiring the Feature Level, the problem here is though that GetWorld( ) returns NULL. I replaced the above line with the below line in CanvasRenderTarget2D.cpp at Line 53 with the following:

FCanvas RenderCanvas( GameThread_GetRenderTargetResource( ), nullptr, FApp::GetCurrentTime( ) - GStartTime, FApp::GetDeltaTime( ), FApp::GetCurrentTime( ) - GStartTime, /* GetWorld()->FeatureLevel */  GetMaxRHIFeatureLevel( ) );

Which stopped the crashing for me. I will continue to test the other issue your having with FCanvas and GameThread vs RenderThread