can't access "Joomla Access Controls" after upgrade from 4.2.19 to 4.7.25
OK so in reviewing the requirements in the documentation, it seems that version 4.6.x was the last version that states explicitly it is compatible with Joomla 2.5 AND 3. The latest documentation (which I'm assuming is for 4.7?) says Joomla 3 is required.  

But the download site clearly says "Download 4.7.27 for Joomla 2.5x/3x".

I'll try a rollback to 4.6.32 and see if the problem persists. 

UPDATE: 4.6.32 solves this issue.  So I guess 4.6.32 is the last version of CiviCRM that works with Joomla 2.5, so I have to stay with it until the Joomla site can be upgraded to 3x.

Would be very helpful if the download page were updated to reflect this.