If you are using the MX-800 Editor, I would open the file and do a "Save As..." with a new file name and then use THAT file to download to my MX-800. You'd be surprised how this can sometimes "clean up" a file.

And as Mike says, always use the Editor that belongs to the proper remote. Some have used Editors with higher numbers and have had success, but there have been those who haven't, and did have success when they used the proper Editor.