Are you dicussing the mediawiki at wiki.dreamhost.com?
Has anyone else seen the issues reported? I haven't, but I haven't spent a lot of time on the wiki.
If we can dupe it, we should report it to support.
I'd be shocked if it were that far out of date but once again, I haven't checked. Considering the current one-click install is 1.8.2, 1.4.x would be a bit old and possibly dangerous to have running.