When I try to open the Dev.exe version of Sins, via the launcher or directly through the .EXE file, it opens a blank application which renders the desktop useless and requires me to open a new one through Task View to do anything. I also cannot stop the application through Steam to open the regular Sins game, and will have to restart to be able to play Sins. Normal game works fine, it's just the Dev.EXE that is broken.
I was able to open it once through the Dev a week or two ago, since then it refuses to open.