Unable to assign keywords to JPGs in Bridge

Hi,

I have recently expereinced errors when attempting to assign keywords to JPGs in Bridge CS4. This used to work a couple of days back but now all I can assign keywords to are dng files.

I use windows 7 and if I close bridge from start up (it loads on windows start) and then re load as administrator then I can assign keywords to the JPGs I previously couldn't.

Is there anything I can do to revert this problem so I do not have to run as admin every time I launch it? Would anyone know the cause of why it happens? It's very frustrating!

Hope someone could shed any light on this!

Cheers,

MJ