I've discovered a problem with the Bootstrap theme. The Social badges on mobile devices obscure the edit buttons on the screen, making it impossible to enter the admin area. I'm seeing this problem on an iPad.
Can you confirm which site this is on?
I recently made some changes for the Bootstrap theme which should, in theory, put the site toolbar above the social sharing toolbar for mobile devices.
Joe - Voice Admin
To confirm, this should now work OK with iPad in Portrait mode, but perhaps not in Landscape mode!
Hopefully that's enough to get you adminning satisfactorily :-)