Yeah, restore may help. Also your os install may be corrupt. Try a different download link to the one you chose and then install THAT one. I know they SHOULD be the same, but just try another and see if that helps.
Backups do not save Profiles. They never have. It a most annoying bug/feature of a Blackberry Backup. I have lost count of the number of times that I have reset my Profiles.
Besides the profiles missing, are the .174 working without problems?
I have the .168 and i like to try the beta version, but you know, i have my doubts.