It looks like this one is being tracked in bug #128735 and #12696. Not that helps solve the problem, but since I'm also having the same problem and was searching the database, I thought I'd put a note here pointing at those other two.
-- notification applet does not display system notification icons on multi-screened display https://bugs.launchpad.net/bugs/71236 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is a bug contact for notification-daemon in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs