Snapshot stopped working

The snapshot key on my offline software has stopped working.  The other keys seem to work, but not snapshot.  I use it all the time, so I have put it in some state where the key doesn't work.  Neither ctrl-s nor the snapshot button on the facepanel display works.  It just leaves a blank command line.  Double-clicking takes me to the snapshot page where I can see all my snapshots, but I can't select them. It works when I select the snapshot using the direct select or a macro that selects the snapshot number.  A macro with just "snapshot" doesn't work.  It's the snapshot key they doesn't seem to do anything.

Any idea how to get out of this mode?