Phun

I'm running the version that Tynan posted on a Mac Mini, there's no real reason it shouldn't be working. There was something in the readme file about 32 / 16 bit which might have something to do with it.

You might have to turn 16 bit textures off (if it is on) or on (if it is off) ?

You need to open the options panel and it is the last item on the second list.

Obviously you can't see what is going on, but you might be able to use this to guide yourself there. (??)
basically click along the top of the window until the big panel pops up and then try and aim for the 16 bit texture box - the cross (X) should appear when you have it, I am guessing that from the fact that on your screen shot there are 'highlights' (white box / marker)

Hope that makes sense !