XPS18 Wireless Keyboard sync problems

I recently purchased an XPS18. I'm not very fond of the keyboard and mouse, and have been using a Logitech K750 keyboard and Anywhere MX mouse which initially paired easily. I had to use the K750 keyboard and MX mouse on another computer (off site). When I returned to the XPS18 I couldn't get the keyboard to pair again. I had no problems with the MX mouse re-pairing. After the initial pairing, I upgraded the 310 Logitech Unifying software to the newer 350. Could this have caused the current pairing problems? Could the newer software be looking for a dongle instead of the integrated receiver? Any help resolving the problem would be appreciated.