Comment 39 for bug 237300

(In reply to comment #32)
> With one monitor active, at say 1920x1200, everything does work fine. But as
> soon as I switch resolution to 3200x1600 causing my second monitor to switch
> on, the systray icon disappears and loses all functionality. The space where
> the icon was is now empty, as if it was simply invisible, but sometimes the
> icons of other systray apps appear there. It stays that way until I switch back
> to 1920x1600, left monitor turns off, I restart wine, and systray is back and
> working again.

Resizing the desktop window on the fly is not supported at the moment, it's not specific to systray. This is bug 13034.