@joe: Please remove the dropdown theme from the official PKG repo as this is the one that is causing all the issues.
Was it left behind to help those migrating by merely overwiting files with the ones from FA 2.4.x? Then it it would be a veritable nightmare with all kinds of files that may get accidentally auto included and executed inadvertently.
If it must be there, then synch it with the one that is shipped with FA 2.4.2. Then the default and canvas themes too can find a place in it.
It is best to remove all themes that will not work with FA 2.4.x. The fact that the existing official PKG had the version number as 2.4.0-2 and also stated so inside it's renderer.php file is what confused me. In fact I thought it was an improved version of the one that shipped with FA 2.4.2 which doesn't appear to have been updated in quite a while - the last time it was modified was on 2015-12-24.
I have removed it from the FA24extensions repo since it is in the AF 2.4 core - otherwise, updating it will be redundant here.
@boxygen: add_access_extensions() is executed in FA 2.4 in index,php, admin/security_roles.php and is defined in include/access_levels.inc. If the themes are a legacy carryover from FA 2.3.x, then they will be present for now and may be used with care. These themes are: bluecollar, dashboard_theme, dynamic, exclusive, exclusive_db.