Others here have been mentioning this over the past weeks, mostly as a side comment in a thread on another topic - Google seems to reset search preferences to default spontaneously. It just happened to me again. I just lost the preference to "open in a new window".
On this browser, I do not flush Google cookies - I have a special purpose browser that use for those kinds of things. The first time a preferences reset happened, I thought I might have messed up. But it's now happened at least four times since January. I'm convinced that it is not a user error here - especially since other WebmasterWorld members are also mentioning the same thing .
It's a minor issue as Google issues go, but it never used to happen at all. So what's going on in the Google infrastructure that is causing this lapse, I wonder. Is Google having a senior moment? Maybe it's just some adolescent awkwardness caused by too rapid growth.