blank text messages

often when I send text messages the other person says it sees my name but the message is blank. I can do a copy paste of that same message and is received OK the 2nd time. last message had 81 characters including spaces(if this has anything to do with it)
This used to happen with my HTC magic, now have a xperia x10 and same thing happens. This happens with several people.
Called Rogers they did some kind of system reset but still happens.
Wondering if it is a Rogers problem or Android.
TIA