Mini Dump bug Check

I have several Windows 2003 Sp2 servers running Citrix PS 3.0 one server restarts after last user logs out. driving me crazy other citrix server are working.

SESSION_HAS_VALID_VIEWS_ON_EXIT (ba)
Caused by a session driver not unmapping its mapped views prior to a
session unload. This indicates a bug in win32k.sys, atmfd.dll,
rdpdd.dll or a video driver.
Arguments:
Arg1: 00000007, session ID
Arg2: 00000001, number of mapped views that are leaking
Arg3: e20c6c60, address of this session's mapped views table
Arg4: 0000001f, size of this session's mapped views table.

Debugging Details:
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CUSTOMER_CRASH_COUNT: 1

DEFAULT_BUCKET_ID: DRIVER_FAULT_SERVER_MINIDUMP

BUGCHECK_STR: 0xBA

PROCESS_NAME: csrss.exe

CURRENT_IRQL: 0

LAST_CONTROL_TRANSFER: from 8098f80a to 80876b40

STACK_TEXT:
f6b2dc48 8098f80a 000000ba 00000007 00000001 nt!KeBugCheckEx+0x1b
f6b2dc64 809c3f2d 8988c3c0 8988c3c0 00000000 nt!MiFreeSessionSpaceMap+0x2c
f6b2dce8 80831be4 8988c3c0 00000000 89ad2350 nt!MiDereferenceSessionFinal+0x21d
f6b2dd04 809130a7 8988c3c0 89ad2350 89ad2590 nt!MmCleanProcessAddressSpace+0x6b
f6b2dd8c 8090a5d6 00000000 00000000 89ad2350 nt!PspExitThread+0x5f1
f6b2dda4 80905b79 89ad2350 00000000 00000001 nt!PspTerminateThreadByPointer+0x4b
f6b2dddc 808286ed bf919887 899c9da8 00000000 nt!PspSystemThreadStartup+0x3c
00000000 00000000 00000000 00000000 00000000 nt!KiThreadStartup+0x16


STACK_COMMAND: kb

FOLLOWUP_IP:
nt!MiFreeSessionSpaceMap+2c
8098f80a cc int 3

SYMBOL_STACK_INDEX: 1

SYMBOL_NAME: nt!MiFreeSessionSpaceMap+2c

FOLLOWUP_NAME: MachineOwner

MODULE_NAME: nt

DEBUG_FLR_IMAGE_TIMESTAMP: 48a2bc35

IMAGE_NAME: memory_corruption

FAILURE_BUCKET_ID: 0xBA_nt!MiFreeSessionSpaceMap+2c

BUCKET_ID: 0xBA_nt!MiFreeSessionSpaceMap+2c

Followup: MachineOwner
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thank you for your help