A place for discussion about skinning and design. Before posting questions here you should review the documentation about creating skins.
So on the last site I've created with the source code (.net 3.5) from just a few days ago on SQL the App_MasterPages/layout.master file is what is being used instead of the layout.master file in my skin directory. Though the css files in my skin directory are being used.
Whenever failed to load layout.master from site skins , load App_MasterPages/layout.master by default so your site not be down. Check layout.master in your skin folder(yoursite/data/sites[siteId]/skins/[yourskinfolder]. Do you touch it?
Thanks for your reply, ironically I just stumbled on the fix.
It is a custom skin, so I did touch it (heavily) and I left out the "leftContent" which causes it to fail, which as you stated, causes it to fall back.
I stumbled on this looking at the system logs.