UltraVNC

I deinstalled the previous version but the VNC on systray does turn yellow.

Secure VNC Plugin 2.3.0.0
There is an X next to AES (128 to 256 bit keys)

I have truned on encyption every where I cann. Is there some hidden place to set the encyption?

I installed 1.1.9 and SecureVNC most recent version. It worked for several days but now I am getting the error message
You have specified an encryption plugin, however this connection is unencrypted. I have tried uninstalling and reinstalling an still no solution. The machines are Windows XP ...