I write my question in a search box (on stack exchange or wikipedia or Google.) when I press enter, it doesn't search.
This isn't a keyboard thing since I've tried swiftkey, android keyboard, Samsung keyboard, and swype.
It is an opera thing, since using default browser, the keyboard "enter" is replaced by a spyglass for search or a tick in a circle for "go" as expected. I've not tried any other browsers.
I only noticed this problem after upgrading my galaxy tab to 3.2...