It seems I've found the problem. In the Home directory there's a folder called ".hplip". Inside that folder is a file called "hplip.conf". Out of curiosity I opened the file and found this (my HP 3700 series was on and setup via the "Printers" app using hplip--still not printing):
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Under the "[polling]" section and the "[refresh]" section I changed "enable=false" to "enable=true". I logged out and logged back in, printed a test page and it printed. I then printed a short document via Libreoffice, it also printed fine.
To say I'm even more confused is understating the fact. Why would an HP printer connected via USB and set up using hplip create a config file where the printer was disabled even though the checkboxes for "Enabled" and "Accepting jobs" were checked under Properties/Policies for said printer? Anyway, changing the two sections mentioned to "True" seems to have done the job. I still have to reboot but I don't think I'll have a problem--hopefully.
I'll post back here if I do and keep an eye on this thread in the mean time. It would be great if anyone else could confirm this "fix".
"Humph. Choice, it is the quintessential Linux delusion, simultaneously the source of it's greatest strength, and it's greatest weakness." (All apologies to The Architect)