screen dimensions and cursor broadcast

no rest for the wicked (me). solved one problem, up to the next. now it is my screens that give me trouble. when using iwt, which now works perfectly, i somehow lost the right dimensions or something, because my cursor never points to all the same 4 locations. there is always one too low or to high whatever i try. i remember reading something about it, but i am afraid i can't find it back. why this problem appeared all of a sudden, only the gods of azeroth would know. who feels like a god?
edit: it is not all the time. in fact, most of the time the cursor broadcast works perfectly. so maybe it is just another consequence of the war of blizzard against bots. and multiboxers, once again, being collateral damage.

If your screen resolutions match for each toon, try opening each of your character's config-*.wtf file and see if the setting for SET uiScale have all the same value in each. It's best to do this here as doing it in-game is impossible because Blizzard only provides a slider for a value that has at least 15 significant numbers in it.