I stopped using skype when all the wannabe scriptkiddies rolled out their mass flock of skype resolvers and IP stressers for being jealous cheeky cunts.
Lets try something else. As someone has suggested earlier on, force yourself to get the 500 error a few times, then immediately visit your error log and give it a post here.
Also, looks like ya broke something, I can't access your site
Code:
MyBB SQL Error MyBB has experienced an internal SQL error and cannot continue.
SQL Error: 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY u.username ASC, s.time DESC' at line 4 Query: SELECT u.avatar, u.username, u.uid FROM mybb_users u LEFT JOIN mybb_sessions s ON (s.uid=u.uid) WHERE s.time > '1421960369' AND u.usergroup IN () ORDER BY u.username ASC, s.time DESCSC, s.time DESC