[THIN] ICA Multiple screen support Issue

Hi

We have some users that have 3 monitors.  When running Published Applications, we find that 2 of the monitors work but the third does not.  You cannot drag a Published Application into the third monitor.  The first 2 monitors are fine but the third is ignored.  The monitor config is as follows:

19" Monitor (1440 x 900 x 32)
19" Monitor (1440 x 900 x 32)
17" Monitor (1280 x 1024 x 32)

We have not changed the default ICA Display memory allocation.  Farm setting "Maximum memory to use for each session's graphics" is set to
5625 kilobytes. 

Im not sure if the ICA session is running out of memory.  Where can I see the session memory usage?  Based on articles Ive seen, you can determine the memory requirements by:

1440 x 900 x 4 = 5184000
1440 x 900 x 4 = 5184000
1280 x 1024 x 4 =  5242880

Based on this calculation these sessions would require 14Mb.  Am on the right track with this?  Im currently running Citrix Presentation Server 4 on Windows 2003.  ICA Web Client version is 10.150.  Can anyone suggest any other changes apart from upping the graphics memory to 14Mb in trying to resolve this issue where I cannot drag to the third screen?

Thanks
Ang

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