Swish. Thanks!If you read just a few pages back more than a couple of people mentions this. So the answer to your first question is yes. How you can fix it; I believe there is a versions tab in the curse launcher where you can manually choose to install version 0.8.3. It is also a possibility that you can revert from a backup. In your curse launcher installation directory there is a directory called Backups, here you will find a backup for packs you have updated, you can then copy that backup into the Instances directory and overwrite your downgraded instance. If you're playing single player you might want to keep the world from your Instances directory and put that back in after overwriting from Backups.