This just started happening. In the backend, I can not browse or edit users.

In CB User Manager, when I click on a user name, I'm taken back to the admin Control Panel.

Changing the Display #, trying to click next, and searching does the same thing.

I've run all the tools, without any difference...

PHP Version 5.4.25
CB 1.9.1
Joomla 2.5.18

I've even restarted the server and cleaned the cache. I'm at a loss.

Nothing has been installed recently. Like in the last two years.

For testing, I did a backup and did an upgrade to Joomla 3.3.3 to see if that would make a difference.

Sadly it's the same behavior.

All third party plugins have been unpublished. I only have one, CB Profile Pro, which I also updated for testing.

I'll keep disabling things and see if things improve.

FYI - the front end works fine in displaying user info. And I can make edits.

Might it be something in a table I should be looking at?

This doesn't advance the view:

administrator/index.php?option=com_comprofiler&task=showusers&view=showusers#3

These are in the error_log from the Joomla 3.3 version
[15-Aug-2014 04:12:59 UTC] PHP Warning: require_once(/home/paulefel/public_html/libraries/import.php): failed to open stream: No such file or directory in /home/paulefel/public_html/includes/framework.php on line 39
[15-Aug-2014 04:12:59 UTC] PHP Fatal error: require_once(): Failed opening required '/home/paulefel/public_html/libraries/import.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/paulefel/public_html/includes/framework.php on line 39
[15-Aug-2014 05:48:43 UTC] PHP Warning: require_once(/home/paulefel/public_html/libraries/import.php): failed to open stream: No such file or directory in /home/paulefel/public_html/includes/framework.php on line 39
[15-Aug-2014 05:48:43 UTC] PHP Fatal error: require_once(): Failed opening required '/home/paulefel/public_html/libraries/import.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/paulefel/public_html/includes/framework.php on line 39
[15-Aug-2014 08:42:12 UTC] PHP Warning: require_once(/home/paulefel/public_html/libraries/import.php): failed to open stream: No such file or directory in /home/paulefel/public_html/includes/framework.php on line 39
[15-Aug-2014 08:42:12 UTC] PHP Fatal error: require_once(): Failed opening required '/home/paulefel/public_html/libraries/import.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/paulefel/public_html/includes/framework.php on line 39

Tried that. No joy.

On both the 2.5.14 and 3.3.3 copies.