FBX exporter corrupting blender animations

I’m trying to export a player model to Unreal Engine 4 using the FBX exporter (Blender 2.71). Unfortunately, it’s not quite working 100%. The animations are partially corrupted. At first, I figured it was a problem with UE4 since it’s still in development. However, the corruption is in Blender itself. After the model is exported, you can see the same corruption in Blender that’s being seen by UE4. You have to reload the model in Blender to clear it. It appears the exporter is doing something it shouldn’t be doing to Blender’s internal data. Thoughts?

Use the ASCII exporter and disable “Optimize Keyframes” option.