I know this isn't actually a OllyDbg problem, it happends with the Visual C++ debugger also.
When I start a debugging section in OllyDbg and run the application and does some things in it, OllyDbg freezes and drags all other apps down with it. I can only force it down if I press Ctrl+Alt+Delete and picks Log out. The same happends when I try to JIT debug an application. It doesn't matter which program I debug. Does anybody else have this problem?
This is my comp.:

Windows 2000 Pro SP2
P4 2.4 Ghz
512 MB DDR
Soyo motherboard (built-in sound and LAN)
GeForce 4 TI4200 with latest Detonator drivers

gliptic: it happends everytime or randomly ? have you tried with different OS ?

Hi, I have WinXP Pro SP1 and have simular but not same problems.

When I debug an application and application is paused windows shell locks up. All other apps continue running, but taskbar and some shell related services don't (for example if application uses ShellExecute() the program do not run). If I press F9 to resume debugged application everything resumes too. The shell operates and runs applications that were not run while it was locked and so on.
The lock hapens at random, it might depend on where in program is debugger (for example breakpoint in shell function).

This must be Windows shell code bug because I experience same lock with VC++ 6.0 debugger with latest service pack.

It happends every time I tried to do JIT debugging. It seems to happend when the app calls some particular APIs when I run an app in debug mode from Olly.

Anonymous, it sounds quite similar to my problem. Probably IS the same problem.