Title says it all really. Photoshop forgets which printer to use, even if you select "Always Print With Current Settings". It's never happened previously with any version I have used. I am running Windows 10.
Are you saying the problem occurred with the latest version of Photoshop on Win 8 and Win 10? Or did the problem start with any version of Photoshop on Win 10? I would expect the latter as the printing code in Photoshop hasn't changed - so my guess is the problem is with an incompatibility with Windows 10. Have you verified your printer driver is compatible with Windows 10?