Cubasis Crashes, Cubasis VST 2 causes eMac to freeze Options

[Quindo]

I have an eMac 700 CDRW running OS9.2.2 & OS10.1.5.
I use an Edirol UA-5 usb soundcard and a Midiman Midisport 2x2 usb midi interface with it. I recently bought Cubasis VST 2 to use with my setup, and everything worked perfectly for a few weeks until one day OS9 froze up when I opened Cubasis. I rebooted manually, but had the same problem when I tried again or when I attempted to run OMS setup or Logic Audio Fun. I contacted Midiman because i thought it might be the MIDI, but everything they sugested didnt work. The edirol card works fine in os10 with audacity, so I dont think its that. Please help!