Suddenly my 'users' group has lost permissions to access all my mounted devices.
used to be able to go onto my FAT32 drives, get pictures off my Digital Camera, etc. but not now. This just happened spontaneously. Everything I've tried doesn't seem to give the 'users' group access again (fstab, etc.) just says "Permission Denied"

any ideas on what would cause this and/or how to fix it?