Multiple Content Block doesn't work in the front end

Hi,
I just update the plugin from 2.0 to 3.1 because it didn’t work anymore.
After the update the most of the problems are fixed but I can’t still see anythings in the front end, actually just in one page. The others works fine.
The back end works good, i can edit and save.
I try to read some forum and I commented out some lines of code but no changes at all.

I also have an error in my frontend after the footer, but just if I logged in.
The error is:
(function() { var request, b = document.body, c = ‘className’, cs = ‘customize-support’, rcs = new RegExp(‘(^|\\s+)(no-)?’+cs+'(\\s+|$)’); request = true; b[c] = b[c].replace( rcs, ‘ ‘ ); b[c] += ( window.postMessage && request ? ‘ ‘ : ‘ no-‘ ) + cs; }());

But of’ course the footer.php is clean.

Any thoughts?
Thanks