winprop across multiple screens not working?

I have a jumpto winprop for GQview that looks like this:

defwinprop{
   class     = "GQview",
   instance  = "gqview",
   jumpto    = true,
}

I have a multi-head setup using mod_xinerama (sorry, Tuomo, I'll understand if
you don't respond!).

The jumpto winprop doesn't seem to work across screens. As in, if I start
gqview from screen 1, and gqview is setup to open on screen 0. Or vice versa.

It works perfectly okay (and so does a float winprop for the same
class/instance) on single screen setups, or if the terminal I start gqview
from is on the same screen as the one gqview is setup to open in.

I have similar problems with skype chat windows.

Any ideas?

Thanks!