OSX Stuck - Window manager is responsive, but can't create any process Shortly (seconds) after booting, the OS (10.6.8) becomes unresponsive. Not a single process can be created, but the window manager is responsive - I can switch focus between existing windows and some already loaded programs - e.g. Terminal, Finder, etc but I cannot run any new processes - opening a browser, or even executing "ls" from command prompt yields no results. 

There are no obvious CPU hogs - I managed to quickly run "top -u" with no high CPU util at the point it gets stuck (at one point the top utility stops refreshing, I suspect it spawns a new process for each refresh).

Any clues appreciated.
After trial and error, the correct answer proved to be such: disable IPv6.
The OSX machine started to freeze when I switched internet connection and WiFi router.