Are you seeing anything in the log under Administration > System Log?
If it fails to load your layout.master file it should log an error and it doesn't seem to be loading yours.
I'm viewing your site with Firefox and the user agent switcher plugin to make it load your mobile skin and I can see it is not using your master page at the moment so an error must be happening.
Newest errors will be at the bottom of the log.
Post the error detail, but please try to only post one entire copy of the error message, please don't post all of the log.
It might be best to clear the log then make the error happen by refreshing the mobile browser and then get the new error and post it here.