i had installed v7.7 before doing last tests this morning.
i already did yesterday a test without .htaccess.
i also tried, before this post, to exclude com_autotweet from beeing protected by adminTools.
500 error in any case.
having run these tests using 2 quite different environment (osx server 10.6 and ubuntu server 12.04) and beeing the only one (as far as i can see) to have this problem, my conclusion is that this issue is related to my joomla site configuration, speaking of sw firewalls, othere components, etc.
when i'll have enough time i'll try to replicate the error on a dedicated pretty new joomla installation. i'll let you know.
This error means there is a problem on the server side. A
can be caused by any number of things from uploading the incorrect file to as bug in a piece of code. This error response is a generic "catch-all" response. The web server is telling you that something went wrong, but it's not sure exactly what that is. If you have root access, you should review your web serverâ€™s error logs to get more information about this. If you are using shared hosting plan, you should contact your host to get more information. The best way to debug the error depends upon the server and what's actually running at the time. Consider some debugging tips to help diagnose and fix common causes of this problem.