I recently backed up and wiped my 9700 and installed OS 5.0.0.428 on my device....
I then downloaded BBM 5.0.0.57 into my device and then restored the backup using DM....
My problem is that I lost several BBM Contact Categories... I had previously had 7 categories and I'm now left with only 2 categories....!!
This has happened before when I wiped and restored phone from a DM backup... but usually when I used the advanced DM restore feature to restore only the phonebook and BBM contacts... it usually works... but this time.... my contact categories are permanently gone...!