Originally Posted by
Saffith
In 2.50.1 and before, when switching drawing targets between the screen and an offscreen bitmap, the subscreen offset wouldn't always be set properly, so drawing would sometimes incorrectly be shifted by 56 pixels. 2.50.2 fixed that without keeping it for old quests; 2.50.3 does restore it in old quests.
That's currently handled by a bit set at the end of readrules() (in 2.50.x, it's set at qst.cpp:2549 and read at script_drawing.cpp:2159). It's based entirely on the version and build; there's no quest rule or anything else saved with the quest file. Quests made in 2.50.3 will function the same in 2.50.2 in this regard.