I recall that there is some kind of know issue re: BBM groups and the (.607) keyboard. See this link to another thread: (which I found by searching .607 bbm keyboard) 9550 beta 184.108.40.2067
Yes.. it is under 'beta .607', but there is no difference between the beta .607 and the official.
I had installed .607 and went back to .517. PERSONALLY, I wasn't happy with the overall performance of .607
But as they say... "YMMV".... and mine did.