There has been a few issues with the server crashing when under heavy load such as backing up etc. Today seemingly several files were deleted and / or corrupt and permissions were set to defaults.
I restored yesterday's backup and it seems OK but there are performance issues and some things such as avatars don't load or take a long time to load. Sometimes the site takes a while to respond and / or load. I suspect by looking at the log files the server has a faulty Hard Disk or corrupt filesystem. In other words the site may disappear for a while whilst it's fixed.
By fire and by blood I join with thee in the Order of the Flame!
Webmaster of Arokh's Lair