CGMINER crashes when using Switch User on Windows. This is the only miner that does this, all other miners continue happily mining in the background.
When the crash happens, the mining kernel continues to run on the gpus but no shares are submitted, and the cgminer interface just hangs and doesnt respond.

I tried all versions back to 2.0.4, they all crash when switching user.

My machine:
Windows 7 x64
Catalyst 12.6, APP 2.7
Radeon 7950 and 5850