Same here, can no longer start folding text directly after update to 10.12.4 . Tried the 2 releases Jesse points to. Works 1 time (when clicking on the foldingtext.app icon directly after installing). When I quit and try to restart (via spotlight search or finder) I shortly see the foldingtext menu bar, but no document. It closes within seconds. I see this in my system logs: FoldingText[1389]: Failed to load Javascript on start
Since folding text is my nr 1 app on the mac, this is pretty ‘annoying’.
I don’t see the ~/Library/Application Support/FoldingText folder in my finder (nor in my terminal). And didn’t see any plugins listed in my preferences when folding text opened 1 time directly after install.
Would love to have some suggestions on getting it up and running again.
Update:
Workaround by starting up via the .dmg. No javascript errors in my system log when starting up like that. Seem to have lost my plugins; empty plugins folder in my application folder. Startup via spotlight still not working.