opera search bar: enter doesn't search 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...
My solution for SO uses an undocumented feature (an easy trick when there's no documentation whatsoever): longtouch the search bar, add it as a search engine, and then use Opera's own search bar for such sites.  A trick you may like with SO is to do this multiple times, then manage search engines, click on one of the SO 'engines', and modify it so that you can readily add e.g. [android] to your searches.  It may feel like a workaround, but the result is more comfortable than what I was used to on desktop systems.