I might be wrong, but I think there's an issue with the latest RPi image (3.0.41).
It looks good initially, on a fresh install I can log in with the terminal (with keyboard but not ssh) and web GUI (eth not wlan). But then I can't actually do anything. Whatever I do via the command line throws back errors, even just trying to change the default password. Any changes made via the GUI are 'accepted' but then aren't actually saved.
Most of the errors on the command line say something related to not enough memory. My sd card has 64GB (exFAT) so this shouldn't be an issue. When I run 'df -H' it looks like hardly any of the card is being used but the free space doesn't show up. Is it possible that something in the partitioning script on first boot has changed? This wasn't an issue using the same card with images 2.2.5 or 3.0.24, I've tried loading it twice and I get the exact same issue.
Let me know if there's any more info I can provide to help diagnose the issue. It would be good to know if this is just mine or if it's an issue for anyone else.