I just built a new PC, and when I reinstalled DisplayFusion through Steam I went to add in my favorite subreddit and I get nothing when I use Single Subreddit, and if I do it from one of my subscribed ones I get this message

An error has occurred while loading the Images.
Unknown Mode: SingleSubscribed
[System.Exception]

EDIT: when I was doing the single subreddit I had the wrong slashes.... This will work for me, thanks

HI, I'm dealing with the same issue.
Any news yet, since the item is clasified as "solved", and the workaround shown is not a solution but a workaround.