The only other thing I can suggest is:
remove all of the cached files in the "assets/cache" folder e.g. docid_?.pagecache.php - where the ? is a number and delete siteCache.idx.php + sitePublishing.idx.php
Once logged in the files are re-built by the system
In 1.0.13 there are also other files in the cache folder as well e.g. sitehostnames.php, sitemanager.php etc. these shouldn't be deleted
If that still doesn't work try updating the site by removing
ALL of the files from the server, then upload the new version and update that way.
Last but not least - If that doesn't work, try installing a fresh copy including DB - just to test if it actualy works
Don't have anymore intellectual answers at almost 3 in the morning