We followed upgrade procedure from 4.1 to 4.2
 

We followed upgrade procedure from 4.1 to 4.2 on one of our sites, and the upgrade proceeded to 100% without Errors.

BUT, all our styles unavailable. The errors are as follows:
1. The forum page produced a blank white page for anyone not signed in. BUT if you were signed in, it became a default MOBILE design.
2. In Styles manager, one of our main themes Cherry-Red was moved under the Mobile manager, and was made the default mobile theme and we cannot delete it.
3. Our other themes in the main area will not display and even creating a new theme from the style manager will not display. The only theme we can now display is the default theme. We tried deleting and re importing the custom themes and they are not working nor are select-able by users. If we activate one as the primary, non-logged in users see a blank white screen and cannot log in.

I did select to delete outdated style vars because our current layouts are based upon default themes. All seemed to merge and upgrade properly...

Any ideas?