Your options are either posting to the bug fix thread for rejuv, or you can manually fix it yourself depending on how recently you saved. You can do this by searching your files for a file called 'Game.rxdata' under the Rejuv 12 folder, from there you need to open the file location, delete the file currently named 'Game', and rename your most recent save otherwise as 'Game'. This will manually revert you back to your past save, but you *will* lose all progress between those points, so if the gap is too big I highly recommend you go to the bug fixing thread instead.