Thanks to everyone for the replies. As to the initial expectations, I was told I'd be working directly with the guy who recruited me (the director of the group here). When I got here, though, he and his wife had decided I should keep working on what I'd done my dissertation on, but that I should add onto it to make a new dissertation for the PhD student they assigned me to. There was never a discussion about which hours I should work (and I did sort of ask, since the hours here in Spain are significantly later than they are in the U.S.--normally people work from between 10 and 12 until 5 or 7. I have a baby and a 2-hour commute, so I have to get in early and home early).
The communication is definitely off here. (For a couple of examples: the PhD student I was assigned to still hadn't finished her Master's and had to devote the last year to that, which I didn't find out until mid-way through the last semester when I asked where she'd been. Plus, I didn't even find out they were displeased with my work--they were ordering a renewal contract for me as of September 9--until their mentor sat one of them down for a serious talk).
Just for some background, though: I have material to write a couple of articles, and I'm currently working on an interior publication for our collaboration based on the talk I just wrote for the analysis meeting (yes, I'm an experimentalist). I had to change gears after the student left, since she and I were going to publish within the collaboration (since her disseration would be done with their data), which would take just forever (the approval process with over 300 members is really lengthy, and that's before it's even submitted).
What I'm really looking for is an insight into what to expect as a postdoc working on an experiment. I know that this nightmare situation (cutting me out of all communication and group events/meetings, reporting me to the legal department if I take my baby to the doctor for a fever, secretly planning to have my contract nullified without telling me, hacking into my computer to remove my superuser priveleges without notifying me, etc.), but I'm hoping it's an anomaly. My husband is thinking this is just indicative of what postdocs have to deal with, and I'm hoping to be able to give him some reassurance that the next one will be better.