BlackBerry Messenger Issue

I'm having an issue with BBM. I don't know if it's BBM or the version(5.0.0.57). I'm able to send to everyone in my contacts except 1 person. I've the normal shut off turn on and the battery pull. I still wasn't able to send the 1 person a message. The other person did a battery pull and nothing still. I've read a few posts about 5.0 but after talking with other people that have absolutely no issues with it how can it be 5.0? Any help would be greatly appreciated. Thanks.

I would suggest that you both delete each other and try to re add after. There could be a hang up that isn't allowing the messages to go through.