Cannot export ANYTHING except MIDI

Using Audacity 2.2.2 in Windows 10 and Windows 7, exactly the same result in both.
I cannot export to MP3. (or other formats)

I have installed Lame_v3.99.3_for_Windows on both Windows 10 & 7 systems.
Lame shows up in the Preferences/Libraries as MP3 export library, with the correct path & file name in both systems.

With current project open, I go to file-export; most options are greyed-out and unresponsive.
The only active options are “Export MIDI” or “Save compressed copy of Project”
Export MIDI seems to work as expected, and the resulting file can be opened OK.

What am I missing or forgetting?

Save Compressed Copy does not work properly; there is no “_data” folder, and the file cannot be opened.
(I don’t expect to use compression, so this probably will never affect me)

That’s most unusual. How do you have Audacity installed? Is it on a Cloud Drive, a Network Connected Drive or other non-internal drive? The Mac people get this when they try to run Audacity from the installer software package and not the actual installed program. Audacity in that case will have no idea what its environment is. That’s sounds an awful lot like what you have.

Forget MP3 for a while. That’s a special case. If Audacity can’t export WAV, that’s pretty serious.

Can you do a screen capture and post it here on the forum?
Screen Shot 2018-04-09 at 22.18.40.png

Does the project have any “audio” tracks, or only “note tracks”?