I also have problems since trying to upgrade to v.0.0.15 that looked permissions might be have something to do with it (Need help troubleshooting TiddlyDesktop version 15). The farthest I’ve gotten in debugging it is at the bottom of my post. Everything worked with prerelease 3 but not with anything after that. You might want to see if it is the same for you. If you’re more knowledgable than I and you see the same pattern with early prereleases working but not 4 or anything later, it might give you a clue.