I have the same issue. I also found it does this in Reason 11 also. Interestingly same issue when I try any file operations. I cannot double click on a folder to open it.
The same problem is happening in my Reaper (6.14) and Scaler 2.1.1, Reaper functions that depend on double left mouse click don’t respond (like rename, tracks or item creation and others)
All turn normal again when Scaler is closed or set it bypass in fx window. The problem occurs in both Windows 10 and 7 and it seems to only affect the DAW, not the OS. There are no problems with file operations either at my end.