I had added an assembly made only of dispplay panels and two of them had part editor cuts. Removing the assembly did not help but recreating the batch without it worked.
I'll experiment more later to see whether the display panels or part editor cuts caused it (or if either one caused it).
Okay, I did some testing with different combinations and here is what I found:
Using my batch that prints and adding the assembly that I suspected caused it not to print.
Closed eCabinets and started with the same number of Standard cabinets, added the suspect assembly and...it printed.
Closed eCabinets and started with my batch that prints, added an assembly made of two Standard Frameless Base cabinets...does not print.
Closed eCabinets and started with my cabinet that was made to hold the suspect assembly, added the assembly and it printed.
Various other combinations would either print or not with no apparent cause-effect.
Once a nest would not print, no other nest (or batch or job, etc) would print before restarting eCabinets.
I can make the nest not print by creating a new batch with all of the cabinets and the assembly that would not print before. I can also make the nest print by leaving the assembly out of the batch.
Sorry programmers, but I just couldn't pin it down to any one thing. It happens with Standard cabinets or with mine. It also prints fine with Standard cabiunets or with my own.
It is definitely NOT a printer driver issue because I tried multiple printers as well as PrimoPDF.