I am maintaining a site that everything seems to be working properly except the posts new and old are not displaying at all. In both preview mode and live on the site they are returning a 500 error. I looked in the DB and tried to use the guid field to link to the post as well and that URL doesn't seem to be valid. I have moved this site from an online provider that I believe had the site on a Linux server and it was moved to a Windows server. Can anyone help? The site URL is http://www.nationalhellenicmuseum.org.