It seems to be a common problem, but I haven't been able to log into my own wiki. I also set the wiki up so you need to be logged in to edit, so this is a big problem for me.
When I try logging in, a message appears saying that the action has been cancelled to prevent Session Hijacking, on something like that. When I tried to find out how to fix it, I noticed that it could be a number of problems as many others have had the same message appear, usually for different reasons.
Anyway, I would the error to be fixed if possible so I may work on the wiki.
The wiki in question is the World Nudism Database.