Photopaint scanning Problem

After happily scanning a few images I now get this message when hitting the scan button:

---------------------------
Corel PHOTO-PAINT X5
---------------------------
The application could not inquire about the palette of the image from the Twain driver. Image acquiring aborted.
---------------------------
OK  
---------------------------

I have a feeling it may be something like the temp files needing to be deleted, but I'm not sure where. Any suggestions?