Well, I tried quickly
I will need to debug it on a test-installation, but will do it after CB 1.2 beta 7 is in testteam, as its probably a bug in joomfish's database layer.
In the mean time, please forward the bug above to joomFish team, we really need to have the mysql cursor returned by their query() method, same as joomla does.
It looks like there is more, but the above is a confirmed joomla compatibility bug of joomFish 2.0 beta.