Last time I contacted Dreamhost they suggested upgrading the php version we are using to see if that would fix the problems.
I didn't really want to do this in case it causes other things to break but they said I can change it back if it doesn't work.
I have just done it a few minutes ago, so now we wait and see what happens...
I'm not very optimistic, especially since I already received a completely different error message (Method Not Implemented) when trying to post in this topic.