I caught about the Internet connection bug here http://forums.veeam.com/post133063.html
but I haven't seen if anyone else experiences this issue:
When clicking on the 'Check Now' button of the Update tab, then 'Last checked <date> <time>" never changes on its own to the new time. It does change if you click the 'Check Now' button a second time or close and reopen the application window.
I can replicate the issue on two different PCs...known bug?