Woops! Seems to have slipped my mind that I switched over from debug builds to release builds, and had copied a slightly older version into the 2.4.14 executable archive (as can be noted by the debugging XWIN/YWIN indicators in the upper left of the screen). Thanks to
Rysen for catching this so quickly, due to a bug related to PCX importing which would crash maped. This was fixed in the release build, although during my investigation I did notice that PCX exporting (F12) was a little off as well, so that is now also fixed: