I'm running 4.6.0.162 on my Rogers Bold (Unlocked). Me and 3 friends all are having issues with BBM being extremely laggy. At times it will work fine and others it just craps right out and does not send the message (or sometimes like 10-20 late). I have one friend with the issue on Telus and the rest are on Rogers. It has been happening for the last couple weeks and it's really starting to **** me off...went back to just SMS for now. Let me know if there is anything that I can do to help.
On Fido (subsidiary of Rogers) and I have had BBM issues for the past few weeks. Come to think of it...ever since the planned outage. Same issues as OP is having.