In the IDE, when I click on Help|Check for Updates while in SB6 (under Vista), the following occurs:

1. when logged in as a user with admin rights (with UAC on) - it eventually times out with connection error (999).

2. when logged in as a user with admin rights (with UAC off) - it succeeds.

3. when logged in as a Administrator (with UAC on) - it succeeds.

What might be the cause of this, and is it the expected behaviour?