(GUI.Label) Line spacing issue with wordwrap

Hi guys.

So we're having an issue with labels (with the old gui), word wrap and line spacing : each lines is almost on top of the previous one, It works fine in the editor but not the build. I'll cut to the chase.

Unity version : 3.5.7 Unity Target : Webplayer Occures on some computers only, without any discernable pattern Font : OpenSans Regular

You can try it here, or download the package to test it here. I saw several questions about that subject, but none of them had a suitable solution. Any way to fix this without implementing our own wordwrapping ? Oh, and upgrading to Unity 4+ is not an option for us right now I'm afraid.