I'm sorry to inform you that today, as the Eve's API-Servers went down in succession of the Apocrypha 1.5 patch deployment, all forum rights have been reset.
This happened because your API-keys are validated against the Eve API every hour to automatically determine membership of groups, Avatars, etc. When this function couldn't validate your keys, it removed all members from the membergroups.
To fix that issue, do the following after(!) downtime:- Go to 'Profile' -> 'Forum Profile Information'
- Reenter your limited API key
- Wait

As soon as the keys are validated next time, you should get all your access rights back.
This thing has one positive aspect:
We now know, that automatic kick out of groups in case some1 leaves the alliance works.

Regards and sorry again for the forum downtime.
Neph