nope downloaded your version. I'll try and make a movie of it to demonstrate what I mean.

I should have added that I'm running this on a macbook pro and using the two-finger scroll to elicit the problem.

Another issue I've discovered it that in the color map menu in the surface controller is really long and will flow off the end of the screen. Choosing the tear off doesn't make it develop an scroll bar, so you can never see all the colour map alternatives. For example, the default in appears to be ngray20 but this does not appear on the menu for me, regardless of whether it is torn off or not.

Also is is it possible to choose between colourised background colours (the 'b' option) and grey scale? I'd prefer the greyscale as for my purposes they provide better contrast than the coloured background.