🚀 go-pugleaf

In addition to Tim's question, can you tell us what graphic formats you're using in the anchored frames. 

Also, are the two printers you mentioned Postscript-capable, and if so, are you running them in PS mode?  

I ran into this same situation with the older FM versions where certain graphics "clobbered" other graphics. The problem was eventually resolved by using a true-blue Adobe PS printer rather than a clonescript PS printer. Your comment about opaque < - > transparent changes is a strong indication that either there's a mismatch somewhere between your printer capabilities and your installed printer driver or else the clonescript built into the printer itself is not as good as it should be.  

Another possibility to test would be to create a PDF using the Acrobat Distiller printer instance as the target device and then print the PDF to your printers.