I'm having an issue as well with FCPX crashing all of a sudden. I got to a finishing point of my video, then I started to add grx and then it suddenly quits on me. I deleted all the grx, trashed my preferences, and I'm still coming up with this crash thread: I can't even keep my project open now without it crashing.
Thread 135 Crashed: BGTask: FFRenderStateTracker Dispatch queue: com.apple.root.default-priority
0 com.apple.ProAppsFxSupport 0x000000010296a6f5 HgcMotionBlur::RenderTile_AVX(HGTile*) + 1877
1 com.apple.ProAppsFxSupport 0x0000000102969e3a HgcMotionBlur::RenderTile(HGTile*) + 10218
2 com.apple.Helium.HeliumRender 0x0000000102cc1569 HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 3817
3 com.apple.Helium.HeliumRender 0x0000000102cc169e HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 4126
4 com.apple.Helium.HeliumRender 0x0000000102cc169e HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 4126
5 com.apple.Helium.HeliumRender 0x0000000102cc169e HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 4126
6 com.apple.Helium.HeliumRender 0x0000000102cc169e HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 4126
7 com.apple.Helium.HeliumRender 0x0000000102cc169e HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 4126
8 com.apple.Helium.HeliumRender 0x0000000102cc169e HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 4126
9 com.apple.Helium.HeliumRender 0x0000000102cc169e HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 4126
10 com.apple.Helium.HeliumRender 0x0000000102cc0995 HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 789
11 com.apple.Helium.HeliumRender 0x0000000102cc169e HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 4126
12 com.apple.Helium.HeliumRender 0x0000000102cc169e HGRenderer::RenderTile(HGExecutionUnit*, __m128*, HGRect, HGNode*, int) + 4126
13 com.apple.Helium.HeliumRender 0x0000000102ce6c99 ExecuteUnitGCD(void*) + 1449
14 libSystem.B.dylib 0x00007fff8a68c2b0 _dispatch_worker_thread2 + 206
15 libSystem.B.dylib 0x00007fff8a68bc08 _pthread_wqthread + 353
16 libSystem.B.dylib 0x00007fff8a68baa5 start_wqthread + 13
I'm not really sure what it means, but if anyone can direct me in the right direction I would appreciate it. I have a deadline on this project coming up fast.
Thanks!!