We found after a recent database server upgrade some issues with our user table. This table stores things like your preferences. It explains why some are setting options and nothing is happening. The result is it appears your option settings don't work. We're looking into it and have finally found the root cause. It might take us a day or so to iron this one out. Sorry about the inconvenience.
We have resolved many issues today. User settings should be ok now, and I will revisit the bug list and see if there is anything else we can fix over the coming days.
The classifieds feedback system should be up and running again today as well.