Hello!

I'm trying to write a small VNCviewer, but unfortunately I have problems with 
framebuffer update requests. The initializing section is OK: ProtocolVersion, 
Authentication, ClientInitialisation, ServerInitialisation. Then my "viewer" (on a 
linux machine) sends a framebuffer update request to a Windows XP machine 
with the normal VNCserver running on it. Incremental is set to zero (false). 
The answer of the Server seems to be OK: message type, x, y, width, height 
and number of rectangles correspond to the demand of the viewer, _but_: The 
data which is sent is only zeros! So the size of the whole answer packet is 
OK, but not the image data.
This is very strange, because: when I first start the "normal" vncviewer, 
connect it to the XP machine and then start my viewer (connected to the XP 
machine and the same display) the frame buffer update requests are 
answered correctly. When I disconnect the normal vncviewer, leaving my 
viewer connected, the answer to the frame buffer update requests doesn't 
change anymore. The server keeps on sending the same data that he has 
last sent, when the "normal" viewer was connected. What does the normal 
vncviewer which my viewer doesn't?!
Another strange thing: when I connect my viewer to a server on the linux 
machine on which it runs there seems to be no problem with the framebuffer 
update requests.

Any help would be appreciated, I hope that I have read the documentation 
carefully enough, but apologize if I have missed something "obvious".

Regards, Hans
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