Thank you for providing this advice, as we used it to mitigate a plugin conflict that resulted in users being unable to post certain kinds of content to a site for several days.
However, it seems unusual/potentially problematic in future that WPDiscuz prevents use of core Wordpress filter "comment_text". Many other plugins call this filter and there is no issue with it if the WPDiscuz plugin is not active. Is this something you plan to resolve or provide a more complete workaround for in future updates?
