[ros-dev] NTOSKRNL bugcheck when clicking on "My Computer C disk icon"

[Gge]

With svn 14668 , Ros bugchecks when I click on the "my computer " icon 
and o then on the "C" disk drive icon as per debug messages below.
This is a regression and it is always reproductible .
I cannot say exactly when it has been broken.
Any idea ?

-----------------------------
PM_OPEN_WINDOW: path=C:\
KeBugCheckWithTf at ke/catch.c:237
A problem has been detected and ReactOS has been shut down to prevent 
damage to your computer.

The problem seems to be caused by the following file: ntoskrnl.exe

KMODE_EXCEPTION_NOT_HANDLED

Technical information:

*** STOP: 0x0000001E (0xc0000005,0x8004773e,0x00000000,0x00000006)

***    ntoskrnl.exe - Address 0x8004773e base at 0x80000000, DateStamp 0x0

Page Fault Exception: 14(0)
Processor: 0 CS:EIP 8:8004773e <ntoskrnl.exe:4773e (io/mdl.c:130 
(IoFreeMdl))>
cr2 6 cr3 d896000 Proc: 80d46990 Pid: f0 <explorer> Thrd: 80d50a68 Tid: f4
DS 10 ES 10 FS 30 GS 23
EAX: 00000000   EBX: 8004635f   ECX: 00000003
EDX: 00000002   EBP: a1f76a88   ESI: 007ecdd8   ESP: a1f769d8
EDI: a1f76d74   EFLAGS: 00010282 kESP a1f769d8 kernel stack base a1f74000
Frames:
<ntoskrnl.exe:3c7d0 (io/cleanup.c:112 (IoReadWriteCompletion))>
<ntoskrnl.exe:3c8e0 (io/cleanup.c:211 (IoSecondStageCompletion))>
<ntoskrnl.exe:4694d (io/irp.c:498 (IofCompleteRequest))>
<vfatfs.sys:c65c (rw.c:775 (VfatRead))>
<vfatfs.sys:dcc9 (misc.c:110 (VfatDispatchRequest))>
<vfatfs.sys:de94 (misc.c:168 (VfatBuildRequest))>
<ntoskrnl.exe:4627d (io/irp.c:211 (IofCallDriver))>
<ntoskrnl.exe:46293 (io/irp.c:226 (IoCallDriver))>
<ntoskrnl.exe:4e6b0 (io/rw.c:154 (NtReadFile))>
<ntoskrnl.exe:38f2 (C:\DOCUME~1\home\LOCALS~1\Temp/ccucbaaa.s:178 
(KiSystemService))>
<kernel32.dll:278f6 (file/rw.c:154 (ReadFile))>

Reaards
Gerard