Using Acrobat Pro (X?) to print layouts, it will about 1/4 of the time fail and I have to kill the Rhino process, and then print OK. Acrobat will often produce a log file, with an entry that looks something like this:
%%[ Error: syntaxerror; OffendingCommand: --nostringval-- ]%%
Stack:
/definecolorrendering
%%[ Flushing: rest of job (to end-of-file) will be ignored ]%%
%%[ Warning: PostScript error. No PDF file produced. ] %%