I am having the same problem. It was fine until a few days ago. I called Bell, and they say all is clear on their end. I was fiddling with the 'options' and may have done something that cause this problem.
I am trying how to reset the twitter app to default settings.
I am using BB 8530.
This has been happening to me too.
Messages from 21212 are split into two and 10 characters or so are lost between the two messages.
I'm on solo mobile with the Blackberry 8130. Anybody know why this is happening?
Sounds like someone where along the line the tweets may have been parsed into something other than plain text into the SMS messages, which would result in non-visible characters and other possible weirdnesses.