I filed this with Ubuntu here: https://bugs.launchpad.net/ubuntu/+source/vino/+bug/394318
And was told to refile upstream. I have not tried onn Gnome 2.28.

Upgraded from Ubuntu 8.10 to Ubunttu 9.04, where it used to work fine. Running dual monitor on separate xservers. When I connect to port 5901, the connection stalls on the first try and is refused on successive attempts. Connections to port 5900 show the contents of screen ':0.0' but controls EITHER ':0.0' or ':0.1', depending on location of cursor local cursor. (When cursor on display :0.0, connected client controls display :0.0. When cursor on display :0.1, connected client controls :0.1, though client ALWAYS views :0.0's contents.)

Expected behavior (expressed in Gnome 2.24):
Connecting to 5900 shows and controls :0.0; connecting to 5901 shows and controls :0.1. This should occur regardless of the location of the local machine cursor (moving the local mouse shouldn't change where a connected client's mouse clicks are registered. Additionally, there should never be a case where connected clients see the contents of one display but controls another.

vino 2.26.1-0ubuntu1
nvidia-180-kernel-source 180.44-0ubuntu1
display 0.0 is vga, 0.1 is svideo
uname: 2.6.28-13-generic i686

I know some bugs in vino can be nVidia binary driver specific. I have not tried using 2 VGA monitors and an OSS driver as I do not have a second display handy and S-Video only works in the binary driver.