Version:           1.0.1 (using KDE 4.5.0) 
OS:                Linux

Sometimes when clicking 'Apply changes' or 'Check for updates', when both cores of my CPU are nearly 100% utilized (for example when running critterding), the button bar goes grey, but no other actions happen and the application is basically stuck.
The menu is still functional and I can quit the application, but the requested action never begins.
After restarting muon, it may then work fine under same load.

Reproducible: Sometimes

Steps to Reproduce:
Start critterding or other CPU consumer to get all cores to 100% use.
Try Check for updates or Apply changes

Actual Results:  
Sometimes UI partially freezes and does not go further, even if CPU becomes idle

Expected Results:  
No freeze

OS: Linux (x86_64) release 2.6.36-020636rc2-generic
Compiler: cc