Help MMS Hidden Sender error?

[spikeithard]

hey for the last few days when someone is sending me a picture text, I keep seeing it in their pop up text (handcent) but when I open my phone, and go into handcent, that picture disappears from the thread and a new text appears in the notification bar at the top that says something like 'hidden sender address' and when I open it, there is just a small empty chat text bubble there.

it only started a few days ago.. virus??

thanks so much for your help