We've upgraded a few client machine's now and hit a couple of issues we have yet to sort out:
These issues can occur on a machine:
1. All recent contacts just 'disappear'
2. Type ahead just doesn't work any more
3. Contacts that have been deleted, magically re-appear
So if you are in the process of upgrading, watch out. If we work out what is going on, I'll put the information here.