Working fine for me. I just logged on and went to modify a reservation without issue. I'm trying to change resorts and nothing is available at the ones I want, but I could get through to the search results without issue.
I don't think so. I was in the site looking at search results for a stay when that happened. It seems like it's letting me back in now. I have no idea why that happened.
I've gotten that error a few times when I was refreshing results too quickly. It basically locks you out as it sees it as a spamming / denial of service attack (too many hits on the server in a set amount of time). I haven't seen it in quite a while, but that's when it seemed to pop up for me.