Unity 4.6.4f1 Editor for MacOSX 10.10.3 (Yosemite) freeze occasionally when Play.

Unity Engine
1

The situation happens while upgraded to Yosemite.
Before freeze, the last message is “Begin MonoManger ReloadAssembly” in Editor.log,
While freezing, I have sampled the unity process in the attached File ( Sample of Unity.txt )

2084621–136302–Sample of Unity.txt (152 KB)

2

For further investigation, it may due to the UnityVS dll + big project.