2 iMacs, networked, not sharing in 10.9.1

Until OS X 10.9.1, I had no problem networking two iMacs. Not any more. The two imacs are side-by- side, hardwired via ethernet through a router. The sharing works, but only in one direction. IMac A can send stuff to IMac B, but B can't reciprocate. The main problem resulting is: I have two printers, one connected to A, the other to B. Until now, I could use either A or B to send print jobs to printer 1 or printer 2. Not any more. I can't even install the drivers in iMac B because, thanks to the one-way-only networking,  it can't see the printer attached to iMac A-so no install. The cables are OK, and hooked up right, because A can send to and drag stuff from B, but I need signals to go in the other direction as well, to run the printers. Got any ideas?

Thanks. I tried it. Unfortunately, it didn't work. The bugger seems to be the one-way network. I don't know why this is happening now, right after I upgraded to 10.9.1, and only happening to one of the two iMacs. The only time it's happened before, the problem went both ways-A wouldn't share with B, nor would B with A. Nothing passed between them until I went through the same elaborate "sharing" setup on both. I knew it worked because the printer descriptions in the Scan and Print box and the  printer dialogue boxes changed to include one identified as "Brother HL-5050 printer @ User's iMac #1 (or #2)", meaning the printer attached to the OTHER iMac. That notation doesn't show up now on either iMac. I'll try zapping the PRAM and then call Applecare.

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