[Jamaican]

I get similar problems as well. I'm using win 7 64bit pt8.04

What I do is I go to the "Hardware" Tab in Pt and then switch to a clock source that im not using and click ok. Wait 5 seconds (u can wait 6 secs if u want lol) and then I go back and click the correct clock source and thats the fix.

If the prob occurs again, just repeat it. (sometimes it gives a msg when ur thru switching clock sources. = I can't remember what the msg says but its basically saying something is out of sync) just hit spacebar for it to go away and wait about 5 secs again and it should all be in sync.

Hope I helped. Sorry I'm not familiar with Cubase.

Also I've noticed the prob becomes more frequent when there are other tasks being performed outside protools, so disable ur network card, kill antivirus, and whatever else is running.

Let me know if it helps.