I have upgraded arcserver and portal to 10.3.1.
I was just attempting to add a new query and it seems the mapservices are not loading properly.
when I add the services the field do not populate in the box where I can select them.
there is also a red ! mark next to the rest url.
I have attached an image for you to see.
I have been having a variety of issue today.
for example I can only open the WAB-developer in IE (11), Chrome and FFox toss errors. maybe it is related.
I have attached that error as well