[Solved] Does not work Live Update
please deactivate other plugins and test it again, this is a plugin conflict. wpDiscuz live update works on thousands of website without any issue, so the only reason of your problem is local plugin/theme/server incompatibility, you should find it using plugin deactivation and theme changing methods.
It maybe a theme incompatibility. Please leave some URL to allow us debug front-end JS errors. Also make sure you don't have wrong code in theme's functions.php. This file is very sensitive, if your code generates errors or you have spaces/line-breaks after ?> and before <?php codes it'll affect all AJAX requests. these generate extra output before file header sent.