Hi,
Having used m3 since it came out I never experienced a hang. However, since I upgraded to m4 I frequently experience hangs when validation is taking place, typically right after I pull & update a major amount of changes from a repository.
When the hang happens, the CPU is at 104%. One page specifically always causes the hang (also on the systems of my co-workers who run m4), I removed it from the project and then validation succeeds but after the mentioned pull & update it often hangs again without a clear indication of what it is hanging on.
I wonder if anyone else is also experiencing such hangs.