Yes, there was a bug when the scale was different to 1, but apart from that I am not aware of any current u/v problem. If I remember right, the level you've uploaded had just the problem that you were hitting not polygons but bounding boxes. When you want UV coordinates, make sure to use polygon mode, otherwise your hit point is not inside the polygon.

If you want, download the latest version, 7.66, here: http://server.conitec.net/down/gstudio_766.exe. If it still does not work with that version, I'll have a look into your code. Please send it to Support then - we'll check what the problem is.