Minor modding lockups cured by Esc key

I recently created a new agent unit but had to progress up the learning curve of finding out certain files were required in certain places. I'd cloned and renamed a number of the more obvious bifs but the first few attempts still failed.

First attempt - clicking the unit training icon froze the game before the training parchment appeared. The music was still paying (but stuttering) so I tried the Esc key rather than Alt-Tab to desktop and 'End Process' the game.

There was a brief (1 frame) glimpse of a desktop-style alert box appearing but the screen was redrawn too fast to see any message. Alt-tabbing to desktop showed that whatever it was had already vanished.

Having unfrozen itself, the training parchment now opened but a black square with a question mark on it was there in place of the unit's icon.

Right clicking on the question mark to get the description parchment caused the game to crash out to the desktop.

I later worked out what was required to get both of these problems corrected, with the question mark thing being the last to be fixed.

Anyway, the point of this message is to say that sometimes these lockups are recoverable, using the Escape key.