Try Updating your PHP Version to PHP 5 if its not that already
I am not sure if this is the case but this problem seems to occur a number of times when migrating wordpress sites or migrating dynamic sites in general. If this is the case make sure the hosting you are migrating to uses the same PHP version your old site uses.
If you are not migrating your site and this is just a problem that has come up try updating to PHP 5. This takes care of some of these problems. Might seem like a silly solution but did the trick for me.
