Could you go into a little more detail about what you did to fix this problem? I seem to have a similar one and it isn’t clear what you did to fix it.
As it happens, I’ve got a 2.0.3 blog running on the same site as my recently upgraded 2.3.1 one. The former accepts http://www.theliberati.net/drink and http://theliberati.net/drink quite merrily. The latter (…/quaequamblog) doesn’t and has all sorts of other problems (including blank pages every time a post or comment is submitted) so I don’t think it can be labeled a hosting problem.
This is getting weirder. It appears to be linked to templates. The problem seems to go away when I use the Kubrick template – still have the same problem with “Classic” though.
I’ve done that, and it didn’t work I’m afraid.