Project won't Play, Playhead won't Move

I use GB 10.3.3 on MacOS 10.15.1. I completed my GB project and shaved off the last 5 empty measures, leaving 153 measures exactly. Now the project wont play because the playhead won’t leave Measure 156.2 (which no longer exists)!

 Rebooting didn’t change anything, so i put the Project number of measures back to 158 and found the rebel Playhead. HOWEVER: relocating the Playhead did nothing—when pressing play it would just go back to 156.2 and start moving.

So, i let it move. When it got to the end (Measure 158) it just goes back to 156.2 and keeps repeating (of course there’s nothing to pay there)…HELP!!!!