I have a user who used to have admin rights but no longer does now. When
he's in GW and tries to create a new mail, the client sits there for
awhile and just closes. If I give him admin rights, then no problems.
I've already tried removing and re-installing the client but the problem
remains. Any ideas?

We're running GW 8 SP1 still. Doesn't sound like HP1 for SP1 is a good
thing to move to...