Have an Epson NX530 connected wirelessly to my Windows 7 PC. Can print two-sided but it only happens 1 out of 10 times, if I'm lucky. For a year I was able to print two-sided but it stopped, and I attributed it to thinner paper (20 lb). But I tried it with 28 lb and still no two-sided. The hardware – rollers, etc. – in the printer may have deteriorated causing paper slippage. I will be contacting Epson Support, so I'm trying to get the right words to use when I talk to them.
I'm sure one of the first things they'll asked is what version of the driver I'm using – so how do I find that (since the printer is wireless, it's not listed in the Device Manager)?