Weird behaviour with Windows+Emacs

[Flatlander]

I have noticed that Irrlicht programs act quite weird when run from emacs; the game window is invisible but otherwise the game runs seemingly fine, e.g. possible mouselock is activated etc.
I have no idea what might be causing it, but I have never seen similar behaviour with other apps or libraries.
Altough it may not look like a big problem it's actually a show stopper if you are using a language that is run as an interactive process under emacs(like lisp, python, ocaml etc.) or otherwise using emacs as your main ide.

Anyone else seen similar behaviour with irrlicht or some other app/lib?