I don't know what has gone wrong with the wp-supercache plugin, but it has locked my blog inside a "403 Forbidden" error for almost 12 hours in a row.
Only the admin pages were fully functional all the time.
Sometimes the blog still works for a user or another, but then again, very fast, 403 error again !
The visitors receive this error exactly :
You don't have permission to access /wp-content/cache/supercache/www.mydomain.net//index.html on this server.»
In my server's logs, the typical error :
«[error] [client 18.104.22.168] [host http://www.mydomain.net (13)Permission denied: file permissions deny server access: /homez.70/mydomain/www/wp-content/cache/supercache/www.mydomain.net/index.html»
(I'm sorry but I can't share the URL to my domain)
Deactivating this plugin, my blog works again (but I have to find another cache plugin fast, 55 000 unique visitors per day is a bit much to ask to my server without a cache system).
I haven't changed something in particular since these last 12 hours, and yet, go figure...
This thread serves as a bug report as much as a help request, if you see what may have caused it, or it you need more detailed information to tackle on that problem, feel free to ask, I'll be glad to provide any additional required details ;)