SeamlessRDP always falls back to 8-bit colour

Greetings.

I am running rdesktop 1.6.0, compiled from sources, on an x86-64 openSUSE 
11.0 system.  I am trying to connect to a Windows 2003 Server.

I have found that I am able to connect at 16-bit colour without problems 
using pretty much any combination of command-line options.  However, 
whenever I try to use the -A option, the connection is made at 8-bit 
colour and the following message is printed to the console:

WARNING: Remote desktop does not support colour depth 24; falling back to 8

I tried forcing the colour depth to 16 with -a 16, but the same problem 
occurs (except that the word "24" is replaced with "16" in the console 
warning message).

Is this a limitation of the SeamlessRDP protocol?  Is there something I 
need to reconfigure on the Windows machine?  Or is this a bug in rdesktop?

Regards,
Tristan

-- 
   _
  _V.-o  Tristan Miller [en,(fr,de,ia)]  ><  Space is limited
 / |`-'  -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  <>  In a haiku, so it's hard
(7_\\    http://www.nothingisreal.com/   ><  To finish what you

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