I have seen a lot of the bugs mentioned in here myself, playing the game on two different systems, and irregardless of whether there were expansion packs installed. The keepers will often not feed the animals like they should, and are resting many times when the message comes up that the animal can't find food. Also, the keepers are really bad about not being able to reach poop that is right in the open. Maintenance workers NEVER tough the recycling bins, even if they are overflowing and you drop several workers right at the bin. These bins are not blocked, but they won't touch them. The game does freeze, and did with no expansions, and also with expansions (have all now but the MM one - won't buy till they fix this issue!!). Not only does the game freeze, but it lags terribly, no matter where I set the graphics, and no matter what else is running. This is a serious bug, and had killed all enjoyment of the game for me. I now play the first one, which had almost no bugs that I could see (not to mention all the cool little cheats and easter eggs that they left out of the ZT2 for some reason!!). I have noticed that this happens more often when I am building elevated paths, Jeep tracks, etc. I have even had freezes during a save, which is very frustrating. Even saving very few minutes doesn't help this. With a more that adequate system for the requirements, and all other games with good graphics running just fine, I thing Microsoft should fix this one. I have not seen the open gate issue myself, but can say for certain that the moose is a real escape artist, and tries very hard to get out no matter what you do. Very high cliffs along three sides seem to work, and I do mean HIGH. I have also seen guests get into exhibits where there was no logical way for them to do so, or even fall into a moat that had a fence around it. Another guest issue I saw recently was a guest that was thinking that they could not see the animals from a certain point, even though there were no other guests blocking the view, the fence was easy to see through (checked in guest mode), and other guests had thoughts in that spot at other times that the animals looked happy or whatever. All of these issues occurred with the basic game, the ES expansion, and still with the AA expansion. All in all a very disappointing product. Cool ideas, but if it won't work well enough to play, it isn't much fun.