We're sorry you've been experiencing these issues; it's just not right that you should have to put up with an unplayable DarkRP experience.
In future, it may be of great help to contact myself (search Mevia - I'm often happy to hop on regardless of what I'm doing if there's nobody around) or another admin to get on the server.
It's a step you shouldn't have to take, but our inactive staff are dealt with independently, and we're always trying to ensue suitable coverage around the clock.
As for the invisibility issue, reconnecting will resolve this although a superadmin will usually restart the server if available.
Many thanks,
