Users/fans having a hard time posting on my site

Hello. My site is

When I’m “not” logged into my wordpress account, I can’t post a message. Users get 404 errors when they try to make a post. You have to play games with the post button in order to post and that’s a big pain in the butt. One user is not coming back until the issue is resolved.

I’ve got in touch with dream host numerous times and they don’t seem to have a solution. I know it’s a problem on their end. I know this because just before I got a new server from dream host put in, every thing worked great. As soon as the new server was put in, posting issues start happening.

I don’t know what to do. Should I pay a computer expert to try to fix this? I just want it to work. That’s it. That’s the only thing I want. I can’t afford to have these posting issues especially since my site is about to grow with the new theme.