lock symbols diabled! Why? and how to fix it?

Question

See, the image above?  the little lock symbol is disabled?  I can't lock or unlock anything.  Any ideas?

Answer 1

Unfortunately, no image is visible, so one guess what could be happening:

You get 10 slots for folder locks (you can see them in Tools > Locks > Folders). Whenever an item is locked by clicking the lock icon, an entry will be added to the folder locks. When there are no more empty slots, the lock icons on the items will be disabled.

Note that if an item defines subfolders, all of them are added to the locks, too, so one item can occupy multiple of the lock slots.