I have updated my system today doing a simple "yum update". Besides some other things, a kernel update was installed as well (vmlinuz-2.6.32-220.7.1.el6.x86_64). After rebooting the machine, everything starts as usual, the graphical boot screen is displayed, but then the boot process hangs and the keyboard is not working properly anymore either (e.g. no switching to a virtual console), only the hotkey [CTRL]+[ALT]+[DEL] to reboot works.
Trying a couple of times, I managed to switch to the virtual console in which the boot messages are displayed (the console must be switched to right when the boot process starts) and the last message shown there was:
Binärdatei-Behandlungsroutinen für Windows-Anwendungen werd[ OK ]triert:
(Translated something like: "register binaryfiles handling routines for windows application")
However, when I boot into the old kernel from grub menu (vmlinuz-2.6.32-220.4.2.el6.x86_64) everything works fine.
It's an AMD x64 machine with RHEL 6.2 incl. latest updates.
If you need further information please let me know what exactly you need.