Canon LBP 3580 using Canon Plus PCL6 drivers. Printer is set to use Envelope size 10 in manual tray, When workstation tries to print a envelope printer goes OFFLINE and it's looking for 80R paper in the manual feed tray. sometimes the printer reverts to 80R even tho we set the printer paper source to ENV 10.
This slows everything down as someone has to hit ONLINE for the envelope to print and anything else that's queued.
I have the same setup in another location of office and they never have this problem.
Mix of Office 2010 and Office 2016 .. all having same issue.