I guess the PHPMyAdmin code is getting confused by eaccelerator. This is the error I get:
Warning: Unknown: open_basedir restriction in effect. File() is not within the allowed path(s): (/usr/share/phpmyadmin/:/etc/phpmyadmin/:/var/lib/phpmyadmin/) in Unknown on line 0
How do I fix that? Do I add the cache directories to the allowed open_basedir variables? If yes: where are they?