We've had this problem as well with all our other code in place with the camera. The solution to our problem was to use IFI Loader 1.1.0 dated 1/26/2006. I think this version allows writing of the entire memory available in the RC (Our code was just a little bit over 25% available memory when we started encountering the problem and the new processor for 2005 has 4x the flash the previous (2005) rc had.)
http://www.ifirobotics.com/rc.shtml
-Terry