I researched a bit on the web and looks like this is more of a site setup issue than a theme issue. Many things could be wrong here – your folder permissions, the .htaccess file could be corrupted, some files did not get uploaded fully, some plugin messing up things etc. You can contact your hosting provider for help and they should be able to tell you the problem by looking at the logs for your account. If this fails and you need me to take a look at this, pls post a private message here with both ftp access as well as WordPress admin access to your server/site and I will have a look. Thanks!