I have tested on Joomla 1.5 up to 1.5.10. Clientexec 3.0.2 - 3.2, yes it works with 3.2, and tested with cPanel up to 11.24.4-R34599 - WHM up to 11.24.2 - X 3.9

Also I will be releasing RC2 in the next day or two. It has major bug fixes, of items that pretty much made CEB RC1 unusable, so keep an eye out for it before you write CEB off as unusable.

Thanks,
Shannon