Sharing a tip I found when working on a CA ITSM 14.1 lab box, which gets more than its fair share of "uncontrolled changes."
The "Properties" box does not come up in Web Screen Painter after clicking a field.
Make a backup copy, and then delete the original file:
$NXCD\Service Desk Manager\bin\WSP.bin
Then relaunch Web Screen Painter and you should have access to the Properties box again.
How did it get tangled? What does WSP.bin it do? Beats me - didn't look that deeply.
But that's the quick fix to get around it.