Keyboard Preferences: two layouts in the Layouts list gives problems with synergy-plus

Upgrading to Ubuntu 9.10 disabled on synergy-plus client many keys of my Belgian keyboard layout:
Synergy server: Ubuntu 9.10
Synergy client: Windows XP
Synergy-plus version: 1.3.4
I could move the mouse in Windows XP but Ctrl+Alt+Del did not work, neither did the SHIFT key work (so I could not type letters like "." "/" "+" on my Belgian keyboard).
I went back to version 1.3.3 but the problem remained.

I was really pissed about this Ubuntu 9.10 fuck up and I was preparing to go back to 9.04.
Luckily my co-worker looked at System>Preferences>Keyboard>Layouts and removed the layout "USA International (AltGr dead keys)" so only the layout "Belgium" remained.
Then immediately in synergy client Windows XP all keys of my Belgian layout started to work again.

So two layouts in the Layouts list gives problems with synergy-plus 1.3.3 (I'm not going to test it with 1.3.4 as this has already taken to much of my work time).

I also reported this at http://code.google.com/p/synergy-plus/issues/detail?id=264 .

apt-cache policy gnome-control-center
gnome-control-center:
  Installed: 1:2.28.1-0ubuntu1
  Candidate: 1:2.28.1-0ubuntu1
  Version table:
 *** 1:2.28.1-0ubuntu1 0
        500 http://be.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status