When I try to load Oblivion Mod Manager, I get the following error: 'Could not load obmm save data. If you weren't expecting this message, please read entry 15 in the FAQ. Error: End of Stream encountered before parsing was completed.'
'Entry 15' makes the assumption that the program starts up, but it doesn't. Does anyone know what is causing this?

It's more likely that you have manually (add or delete files) done something in the Data folder while OBMM is not in the safe mode.

I can only suggest that you reinstall OBMM.


EDIT: Try to start OBMM with the command \OblivionModManager.exe -safe (start then run)

Didn't see your edit, but I reinstalled OBMM and it opened fine, thanks.

You're welcome.

Remember the obmm command if you have the same issue again.