I don't know what your issue might be.... If you are using different versions of the menu, the names of the save files may be different (each menu looks for a specific name when loading).
Also, I've noticed that if you use different versions of the menu, and mess around with all the features (especially the dumping), the SD card can become corrupted (and I need to re-format it completely to get it working again, so that the menu sees the files on the sd card).
I'm assuming the contents of the .sav file are ok. Sorry, don't know what else to tell you about the situation.
BruceG