Focus guake instead of hiding when F12 is pressed but guake opened in background (hide on focus loss disabled)

I'm running guake in Gnome, inside an Ubuntu virtual machine inside a Mac. Everything works great, except for one minor annoyance: from time to time hitting the F12 key doesn't reveal guake. Whenever this happens, hitting F12 a second time always brings guake up ... but it's kind of annoying to never know whether I need to hit F12 once or twice.

Is there any way I can provide further debugging info so that this could be addressed (as I imagine it's impossible to fix with this little information)?