Daryey, I am with you....I went back to 148 and there is no issue with the same emails. Since I am running Tmo, the 148 isn't ideal because the edge/EDGE issue using GSM.
I think I am go to try the swap a radio technique and use the 151 radio with the 148 OS. That probably doesn't help you, but I agree that I have to blame the OS on this one. If you are interested I can post the results from running 148 with the 151 radio, but this text attachment issue makes the BlackBerry useless from a power corporate user standpoint.
So, I have to go back to a previous OS in order to stay in touch with work peeps.
If anyone else knows how to get rid of this text issue, we would definitely appreciate the help.