When entering both X and Y distances into Archicad, do you have a habit of typing a comma in between them, instead of X and Y?
Here is a tip: You can re-assign the "comma" key to be a shortcut to the "Y" coordinate, so typing "4,3'" would actually enter 3' into the Y coordinate box. (OK, you can call me insane if you want to, but I like it!!)
Tom Waltz