I'm having an 'interesting' problem since I updated to PR1.1 on the n9. I noticed my contacts were lacking Twitter information, so I deleted my twitter account, in order to recreate it. After that, I had to use the trick described on this page to be able to connect to twitter again, and then magic, my contacts had their twitter information back... until I rebooted the telephone...

Anyone experiencing this problem with Twitter contacts disappearing from Contacts?