I've got a bit of a weird one here.
Whenever I paste text that is copied from the address bar (or misc apps, but easily reproduceable from the URL bar) on the Linux cefclient build, the browser will lock up for approximately 12 seconds. During that 12 seconds, if I go to another application and copy new text while the cefclient is locked up, it will immediately paste the text that I have just copied.
I've been trying to figure out why this is happening (both in cefclient, and our custom application), but I haven't figured anything out yet. It doesn't seem to happen in cefsimple.
To test it I've just been running with --url=http://jsbin.com, adding an <input/> to the DOM, and pasting into it.