When the Palm Desktop backs up files, it converts all the spaces in filenames to underscores. This can cause a conflict if two files have similar names, one having understores while the other has spaces.
In the TealTracker 1.28, we changed the default report save name from "TealTracker Report.PDB" to "TealTracker_Report.PDB" to make it compatible with the PocketPC version of the program.
If you have any older reports saved with the previous default name, just go to the report screen and browse the saved reports and "delete" the older file with the space.