I am using motu ultralight with my hackintosh, so far I've been unable to solve the unstableness between each other. I have tried RME firewire, and it works fine ,after 2 crushes. However Motu works fine on IMacs. Did anyone have the same problem, and does anyone have any solutions to this problem?

Could be the ps2 mouse or keyboard even if you use one.

try to use only usb mouse and usb keyboards, then delete the ps2 related kexts (backup them) in S/L/E