I've got the Mac program of Spots up and running (with V6.051) - and it has almost no problem with graphics. There are some oddities though :
A) Mouse wheel doesn't work
B) Joining a network host currently abnormally exits the program
C) smalfont.bmp is initially loaded, but, after a screen resolution change, all characters are just white rectangles, which leads me too :
D) Screen resolution change - this works fine on Windows, but abnormally exits the program on a Mac
(C) I have similar problems with switching between fullscreen and windowmode, all sprites becomes white blocks. (windows XP)
Odd!
It's a driver problem. The driver is recreating a new context then. Are you using multisampling?
Yes, I am using multisampling.