Since last month, I've been unable to select Microsoft Sound Mapper as an output device in Options -> Output.
Rather oddly, because I had XMPlay set to Microsoft Sound Mapper before the update was pushed down (and it's also the default setting when XMPlay is first run), XMPlay can still play audio, but whenever I try to navigate away from the Output menu, XMPlay will always ask me if I want to discard my changes.
I have tried deleting xmplay.ini to see if it fixes the problem, but it does not, which leads me to suspect that this may have something to do with the latest feature update to Windows 10.
A smaller potential issue I noticed is that XMPlay occasionally loses focus when I close the Options window, as though I had accidentally clicked on another window after I closed it.