I had exactly the same problem. No of the suggested 'self help' solutions worked for me , ref. :
What *DID* work for me were to download version 3.10 from my Downloads at my Stardock account ( https://store.stardock.com/myaccount/products ) and then install that on top of what was already installed (I installed the version 3.10)
The way I comprehend it , then Stardock messed up somehow, either they made something that introduced a problem, or they offered us an update that we were not entitled to so that product did not work correctly after install because of too old product key or something.
Anyway , as written then just download and install 3.10 (or what is your correct version via your account download !).
It appears as if some people have issues with 3.10 (3,1,0,5 is the version installed on my system) , ref. :
If your issue persists then solution appear to be to uninstall v. 3.10 and reinstall v. 3.09 .
(I personally do *NOT* have 'WallPaper Engine' installed so my issue with Fences has nothing to do with that !)