I have a 3100cn with A6 firmware. I have several PCs on a home network running Win7 64. For some reason on one of them, I get an error every time I print "Invalid PCL file" -- no matter what I try to print. Even more confusing, if I use the PS driver, I get an "Unknown Error Occured While Printing" -- except if I try to print Adobe Acrobat files and then it prints just fine.
The other computers have no issue, so I'm thinking it's some kind of problem on my computer (Dell studio win7 64).
Any ideas? The 3100cn has been a fantastic printer and I'm not really excited about getting rid of it if I can fix this problem. Thanks to all for their feedback.