Unfortunately, the problem may have been tied to persistent data then. To get it start working you might have to use the "erase all data" option in the extra menu, uninstall, and then reinstall to fully refresh things. I'm sorry for the trouble.
Viewing post in XOXO Droplets: Extended Edition comments
Is the Steam you're using entirely new? Or is it the same Steam account as before? If not, that could keep you stuck with the problem. Unfortunately, there's not really enough info on how this could've happened for us to know what might have to be changed, mainly because there aren't more reports of it. This is a very persistent problem for you, but not a persistent problem for the game generally. That's why trying to reset the game's info on your end might have an impact. I'm really sorry you have to be struggling with it, there's just few options for us to help with it with the way things are.