First things first, back up the project that has the web browser components, if needed. On the client side, try deleting the entire .ignition cache. The cache is where the JXBrowser profile directories are stored, and we changed where in the Ignition cache those profiles are stored so they aren’t shared between clients.
If you can’t delete the entire cache, try deleting just the ./ignition/cache/Cache folder. If that doesn’t work, or that folder doesn’t exist, you’ll need to contact support and have them troubleshoot some more.