My Google and Bing Webmaster Tools account is full of server 500 errors for one of my sites. At first I thought this was a mistake as you click on any of the urls and they load just fine. Then I tried fetch as Google and Fetch as Bing and I get 500 errors. I tried hiring someone to help me with this. That person diagnosed a bad plug-in, (these are WP sites), and deleted all the errors from GWT and BWT. Within a week, all the errors are back in the Tools and the URLs are giving 500 errors. So I think we can safely assume the problem is elsewhere.
I would be willing to compensate someone who could both fix this problem and explain to me what I am doing wrong so I can learn.