Thank you, Eewrie, for writing that down. I'm having the exact same problems, but people keep saying that I should cut the costs (by 'culling' my animals') in one way or another. NO. Before the patch my zoo was doing great. Guests were happy, my food didn't cost more than I made as a profit, animals weren't being boxed randomly, guests weren't leaving because they're 'unhappy with visit', etc. I also have the same bug when pausing the game and then unpausing it; it takes a while for my zoo to 'start up' again (sometimes it just crashes) and when it does, I have significantly less guests. The same happens when I place or adjust a path: suddenly I go from 7K guests to 400!
And about the issue tracker: It would be nice to see a status change instead of just 'confirming' all the time. That doesn't tell me ANYTHING. Are you working on it? Is it a known issue? If it's a known issue, why isn't it officially listed as such? Could you give us ANY kind of feedback on what you're working on or even aware of? And how about people who've been playing (and as such essentially beta-testing) the game get some kind of reward for doing so? Maybe a small refund, or a discount on a future DLC (or maybe one for free)? As it stands we've all been playing a buggy, half-finished game that should never have been released this soon. Why not wait another six months and polish the hell out of it first? Or why not, oh, I don't know, HAVE A LONGER BETA TEST PERIOD?
Right now I haven't played in two days, because my franchise zoos, BOTH of them, are mucked up. I can't load them. Can't play. And I really don't feel like starting all over again after all those hours put into both of them. I'm seriously considering getting Steam to refund my game, because right now I can't play it. It's as simple as that.