Hi All,
Really quick update, from the emails I’m getting it looks like the livetiles aren’t behaving well after users update to windows phone 7.8.
This problem seems to be experienced by others, I’m trying to work out whats going on!
http://forums.wpcentral.com/windows-phone-7/214957-3rd-party-live-tiles-stuck-since-7-8-update.html
GripDev 
Good news! This appears to have been fixed by the latest Windows Phone update (7.10.8862.144).