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XF 1.4 Can't send PM anymore / can't disable add-on,...


Active member

Since today, as admin, I can't send PM anymore, can't disable add-on cause I get an error message like:

CAUSES OF: Security error occurred. Please press back, refresh the page, and try again.

I tried on another browser but same problem. Cache purged but same issue.
I did not change anything on my side so I don't understand why I get this message and I think other users are impacted too but I can't verify cause I'm not able to send private messages to them.

What can I do to solve this issue please?