I know your demo template and showcase works at this width, so I may have broken something.
I've tried to back-track to fix the issue (removing all custom css) but to no avail.http://cc.elrs.info/
(login is clifton : clifton0505)
I've tested this in several browsers including stock Android browser.
Open the homepage at a width less than 710px and the photo showcase will not appear.
You can make it appear by making the screen wider - and the showcase will remain if you go back to the smaller width. There are a few other tricks that make it work in different browsers (like opening the mobile menu and closing it again - this works in Chrome but not Firefox).
Using Firebug, I noticed that s5_photo_showcase_outer is set to 'hidden' when this problem is evident, but I still can't figure out how to fix it.
Any help would be reatly appreciated!