Can you get us a sample of OmniWeb while you're seeing the spinning beach ball? You can do this from within Activity Monitor.
Launch Activity Monitor.
Find and double click on OmniWeb in the list.
Wait for OmniWeb to start spinning.
Click on the sample button.
Save the sample to disk and send it to
OmniWeb5@omnigroup.com with any other details you may have noticed. We'll look into it as soon as possible.
Thanks!