With the move onto the new server the support system will also change, we know there was a forum but this wasn't really the most effective way to give support. In 95% of the case a contact by mail was required and solved the problem. Therefore we decided to drop the forum and give support primary by email and to use an issue tracker on github which is way more popular than the previous used bitbucket service. Ok in summary you have different options to get support or report an issue:
In case you still would like to check the old forum check http://forum.latexing.com but the forum just has read access only and new registrations are disabled.