Hi every one:) my first words in here..

I have a problem. i get this "click" sound now and then when i use a virtual instrument. I use Nuendo and mac osx panther. I dont know where the problem is, dont know where to start looking. Its when i use any virtual instrument. I watch performance, and the cpu isnt to high, but when i use a instrument it suddenly peaks, from nowhere, and cause of that i cant use a instrument. who want a scratch sound every 5´th second in a song ;-)
Anyone in here that know what i can do about it? and excuse me if i explain terrible. im norwegian, and not easy to explain in english when it comes to technical issue.

Another thing; When i earlier used cubase, and i moved the left or right cursor, it showed all over the screen where i moved exactly, but now, in nuendo i only get it marked in blue in the upper field. Look for an option in preferences, but i dont find. its too clumsy moving the cursor a bit, and then check if its right watching 30 channels down the screen. There must be an option for viewing my move all over the screen. or not? Anyone using Nuendo in here?

Thankfull for any reply:-)
Budbringeren