Was actually going to ask for a recommendation for quality ink for refills, thanks to you and Thombar for the pointer.http://www.printerknowledge.com/members/thombar.11430/
I am referencing the thread at:
http://www.printerknowledge.com/threads/pgbk-doesnt-print.9121/
...but I didn't know if I should bump an old thread - OPs, if you prefer to merge, please do and accept my apologies.
I too have a MG5320 with PGBK issues. I think I made a mistake, though...