This seems to go away when you disable hardware acceleration: Tools -> Options -> Advanced -> General -> Browsing, uncheck the "use hardware acceleration when available". Then restart Firefox.

Seems like a bug to me. Hardware acceleration should impact display, not printing... and if it impacts printing, it shouldn't impact it this way.

WOW! You're amazing. Thank you for figuring this out and posting the solution (it works, just tested). Talk about tucked away in a corner.... Thank you × 10!

Oh man, you really made my day!! This nasty error has been torturing me for several weeks now. I installed and reinstalled and again all Adobe software, with no effect, I checked and rechecked all settings with other pc's since they all made perfect PDF's. But not this one!!

Unchecking the "hardware acceleration box" did the trick. Who would have thought of that one!! Just look at my happy face now.

Mozilla should really fix this weird bug.