Mine did the same. I installed the new Beta version and opened it after that. It kept crashing. I then restarted my laptop but it kept crashing. Then I saw "Syncing Rigs" appear on KPA Stage. I waited over 30 minutes but nothing changed. All this while, the Rig Manager won't open and keep crashing. I then restarted KPA but the same thing except no more "Syncing Rigs" pop-up on KPA. I restarted my laptop again but Rig Manager keeps crashing. Any help is appreciated. Thanks in advance !