I was able to run the program and draw stuff fairly well on my macbook pro running leopard. I was not however able to use pressure sensitivity on my tablet or save/export my work. kindof a bummer that last bit. The program crashes on launch unless you put a gdiplus.dll into your windows/system32 directory the .dll is availible at http://www.dll-files.com/dllindex/dll-files.shtml?gdiplus