2.1.5 > 2.4 beta: Dashboard works, not Forum, Users lost their roles.
After I tried upgrading an empty installation of vanilla (which worked perfectly fine) I tried upgrading my 2.1.5 forum to 2.4 beta.
Interestingly, the dashboard works when calling /dashboard/something, but the forum itself gives a 500 error. In addition, all users lost their roles. Can anybody tell me what went wrong or I should upgrade maybe to 2.3 before? Thank you so much!