Mouse.X("Layer") issue

So I'm working on an RTS at the moment, and I am finding that everything is working when I run it as a preview through C2. Though, when I export it and run it either as an APK, EXE, HTML, etc it seems to create some sort of error.

Specifically, when I click on the map, it returns an X & Y co-ordinate that is directly related to the mouses X & Y co-ordinate, but the characters seem unable to move any further than the top right hand corner of the map.

I have attached a dumbed down version of the game, so you can see what I mean, and hopefully lend me a hand. <img src="smileys/smiley1.gif" border="0" align="middle" />

dl.dropboxusercontent.com/u/108799982/Capx%20Demos/Movement.capx

It seems it's generating the pathfinding grid based on the menu layout so it's only 1280x768. Putting 'regenerate obstacle map' at the start of the game layout gets it working.

You're a genius. [:-)]