We have a Magento 18.104.22.168 site that works perfectly on our development server, but when deployed to production, throws errors that it can't find custom module classes (
Mage_Ultimo_Helper_Cssgen is one example, it should be looking for
Infortis_Ultimo_Helper_Cssgen), but the admin throws an error looking for another class).
The production setup is load balanced between two servers and the code is located on a shard NFS mount. Permissions are set 755 for directories and 644 for files, and the owner is set to the apache user. I have confirmed that all the files are present and the module XML file is present as well.