[Kopter]

I downgraded back to .517
I was not happy with .607 because:
~These key (for me) apps stopped working or caused reboots: Scanner Radio, Life in Pocket, Drivesafe.ly, and Where.
~BBM groups/keyboard issue. Yes, there is a workaround by frankly... why?
~SMS messages were received by the device but didn't appear in the message list. Audible an visual notification that txt was received but then screen would freeze, and there would be a blank space in the message list. Had to select the blank space and then hit return to see the message but it was deleted/missing. (!) (?)

Now.. back on .517... all is good. EVERYTHING works without a hitch.

YMMV but my experience with .607 was cruddy.