Itunes remote app not working fully
I've been using itunes on a PC and the Remote app on my iphone for a couple years. It's been working great, but a week or two ago a strange problem appeared. I can see my itunes library on my iphone and ipad, and can navigate, skip to next track, go back, etc., but I can no longer click on a song and have it start playing. I now have to click it, say "play next", then click the fast-forward button to get it to play. Once the track is finished, itunes goes back to the next song in the original order, prior to me adding the new track, rather than continuing to the track after the one I added.
What's going on? I see there was an update a week or two ago; did something change? The update notes don't mention anything like what I'm experiencing. I've done a reboot of all devices, but it's still happening.
This is getting frustrating. My music server is nowhere near where I listen to music, and I find myself needing to go to the PC to do what I used to be able to do from the phone.
Help!
iPhone 6s, iOS 10.2.1, itunes is on my PC.