Citrix Systems Citrix MetaFrame Application for Windows 1.8 - Manual (Page 155)

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If the DirectICA stations display a logon screen but the mice and keyboards do not
work, a base address conflict is the likely cause. Compare the base address used
by the multi-VGA adapter with the address ranges used by other devices on the
server to see if there is a conflict.
To change the base address of a Maxspeed MaxStation adapter, run DirectICA
Configuration, change the base address to the appropriate value, and then restart
the system.
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IRQ conflicts can cause the following symptoms:
u DirectICA station keyboards do not work but the main console keyboard
works
u Mice do not work
To solve these conflicts, run DirectICA Configuration, disable autoselection of
IRQs, and then select IRQs manually. The new settings take effect when you
restart the system.
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If a DirectICA station does not display the Windows Logon screen after you have
added a connection using Citrix Connection Configuration, verify that you have
sufficient Microsoft licenses for all active DirectICA stations and that there are no
licensing errors in the application error log. Use Event Viewer to view the
application error log.