The Joomla 2.5 (1.7) version of ABPro does not work for some sites in time zone UTC+1 (GMT+1).
I am not able to reporuced the behavior and all attempts to fix it has failed.
If you are in timezone UTC+1, running Joomla 1.6/1.7/2.5 - you may encounter problems.
#UPDATE Mar 31/12 #
A fix seems to have been found and will be coming soon.