Oh... if you can view the database, you can look at the #__extensions table, that will narrow things down too. Basically, check if there are 2 rows that have the 'element' name of 'com_community'. My guess it there will be, with IDs of 10001 (JomSocial, incorrect) and 10014 (Community, correct). If they are both there, that proves its the issue.
The SQL to check would look like:
SELECT * FROM #__extensions WHERE element = 'com_community'
I hope that helps narrow things down.
Thanks,
Alex