I've just installed WinVNC version 3.3.7 on a Windows 98 box, and
Chicken of the VNC 1.3.6 on my iBook running OS X 10.3.4. When
I try to connect to the WinVNC server, I get a blank window briefly,
which then goes away, and then I get a dialog box that says
"ZLibHex unknown encoding 129 encountered" with the options
Quit, Reconnect, and Ok.