Suddenly prints images in reverse or negative or polarized
I've never witnessed an issue like this before. Suddenly my machine is printing graphics with colors inverted, like a photo negative. It doesn't always happen, which is blowing my mind.
If I open an image in Preview.app and print, it prints in reverse. If I open, say, this url the "Inc" logo prints in reverse, but text is black on white. If I print some other Web page, it prints normally.
Has anyone else ever experienced something like this? This is near impossible to troubleshoot. I've removed and re-added the printer and that didn't work.
It's an HP LaserJet 1020 on Snow Leopard.
I've tried the same printer with a different machine, prints correctly. I've tried swapping printers, and the afflicted machine still prints in reverse. I've restarted my machine. I've applied all software updates. I've tried printing from Acrobat Pro instead of preview, same problem.
Again, it used to work flawlessly, now this madness.
Has anyone else witnessed this behavior? I feel ill.
Mac Pro, Mac OS X (10.6.7)