I've been trying out zoom for pokerstars.es for quite a bit today.
At first sight it seemed everything was working as it should, however after a short while I realized that only approximately 60-70% of the hands are actually with the correct HUD stats. Some hands the HUD updates correctly to the new players at the table, however sometimes it does not change at all and keeps the HUD stats for the players from the previous hand.
I have played quite a few hands with feature logging enabled. If you wish me to email it with the details please let me know.