Trying to set up wireless printer on new computer. Get drivers, doesn't appear on network. Reset network settings on printer, still doesn't show up. Go to other computer on network, which was already set up to use the printer, and it doesn't work there anymore either. Reset network settings a second time, still doesn't work. Double check IP address in router and on printer. They match but manually enter in the correct IP address on printer anyway. Now printer shows up on new computer so I add it. Try printing something. Doesn't work. Try again just to be sure. Doesn't work. Go to other computer, and try to print off two things there. Doesn't work. Go back to printer and hit "back" from the main menu. Suddenly it says it is receiving data. But it doesn't print. Go back to main computer, try to troubleshoot in various ways, including fiddling with firewall, for about ten minutes. Nothing works. Open up properties in device manager and do nothing else, suddenly all the previous documents print. Try printing things on both computers, everything works fine without delay.
Computers really are mystical creatures.