I just bought an Imac with the latest SnowLeopard version. I was surprised to discover that Zadd and Zsub fonctions are totally inverted. My version is 3.1.2
I will update soon, but anybody heard about this strange bug?
I got the same thing in 3.5r3 Windows Vista. Restarting the program usually works… but not this time 
if you use a display tab
If your pentablet pen has a option to switch from pen t eraser try it when you switch to eraser it inverts.
I had the same problem with my xp pen artist i changed the binds so i dont switch accidentally .
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