Try on a Clean Profile.
If happens then it would need to be reported, if not, you have to check your Profile settings or set up a new one if the source can't be found.
Once working again, do weekly back ups.
If a new Profile is needed:
You could try pasting some files to the new one from the old one - look at the Signature -.
Paste old files could repeat the same problem.
For the Suggestions, post on Features Suggestions SubForum.
Look at SessionBuddy Extension on the meantime.
"Off Topic Tip"
Follow the Signature's Backup | Reset link.
Take the opportunity to start a Backup plan and even create a Template Profile.
SyncBack | Synkron helps.
Windows 7 (x64)
Opera Test profile | Back up | Reset
Re: [Suggestion] Able to select multiple tabs at once and move the all together.
Would be awesome to do this, to move tabs in bundle is necesary sometimes, for example when u move tabs for a presentation and then u need them like u had them before.