I updated a whole clients site today Joomla 2.5.16 -> 2.5.20.
At least I wanted to update AdminTools 2.2.6 Pro to 3.3.0 Core and got a blank page as result, when set error_display to max it said sth about the core.php-systemplugin combinecache function (line 82), which was used before - the combined cachefiles are still at its place.
I did search, found that the whole admin-components area /admintools was deleted during upgrade, because this strange message:
administrator/components/com_admintools/sql/install/mysql/uninstall.sql was not found
while trying an uninstall.
after manually uploaded the components-admintools section, came an errormessage at trying to enter to admins components is:
Function 'AEAutoloader' not found (function 'AEAutoloader' not found or invalid function name)
Recounting the assets table of first 50 extensions at the list brought something that I really wonder about:
6 components seem to lost their xml-datas (com_jce, com_cjlib, com_jvotesystem, com_nonumbermanager, com_xmap, com_checkin)
Of course, the easiest way to do my job is... I do the upgrade process with a backup I did again.
These infos maybe help you a little bit, I have seen during my search here that some people have similar probs... if you need some more infos or the errorlog etc., feel free...
best wishes,
Pierre.
Joomla Business Support in deutsch
www.joomla-praxis.de