We have some language versions and a lot of URL parameters like #control-chars
After this change, google +1 button is showing error (warning - triangle with note of exclamation) when you click it:
var addthis_share = {
'url': "http://unicode-table.com/"
};
p.s. sorry for our English :)
I was able to +1 it, so it looks like the problem was only temprorary. (Very neat tool, by the way!)