I'm having difficulty receiving specific types of SMS messages.

I can receive SMS messages if they are initiated on the phone (Sprint or other network) or on an SMS service website.

I cannot receive SMS messages if they fall into one of two categories:
- They are a reply to a previous SMS I have sent someone.
- They are sent from the Sprint PCS site and contain one of those EMS type images (smiley face, etc.)

I have had this problem with an earlier, trial version of Treo300SMS installed and without.

Has anyone else encountered this? Find a resolution? Sprint tesch support is stumped (surprise!) but they do have a ticket logged.