Mouclass crashes or does not operate properly

Occasionally I have problems booting the latest CVS ReactOS in bochs.

I've seen several things happen, such as these:

Win32K: Failed to open mouse.
Failed to initialize input implementation.
(init.c:918) SM: Failed to load subsystems (Status c0000001)
(smss.c:79) SM: Initialization failed!
(ke/error.c:28) Hard error c000021a
(ke/catch.c:130) Unhandled UserMode exception, terminating thread

And these:

Loading Mouse...
DriverBase for \SystemRoot\system32\drivers\mouclass.sys: ddb5e000
ExceptionRecord->ExceptionAddress = 0xc000f6b0
KeBugCheckWithTf at ke/catch.c:152
Bug detected (code 1e param 0 0 0 0)
KMODE_EXCEPTION_NOT_HANDLED

Page Fault Exception: 14(0)
Processor: 0 CS:EIP 8:c000f6b0 <ntoskrnl.exe: f6b0>
cr2 20 cr3 29f000 Proc: c11d0870 Pid: 1 <SYSTEM> Thrd: c11d2528 Tid: 1 DS 10 ES
10 FS 30 GS 10
EAX: 00000000 EBX: c11f8ab4 ECX: c11f67b8
EDX: ddb5f15f EBP: c00c55f0 ESI: 002c1000
EDI: 00000000 EFLAGS: 00010282 kESP c00c5568 kernel stack base c00c3000
ESP c00c5568
Frames: <psaux: 1211> <ntoskrnl.exe: 40ef5> <ntoskrnl.exe: 40f0b> <mouclass:
1430> <mouclass: 1822> <ntoskrnl.exe: 3b675> <ntoskrnl.exe: 3c36c>
<ntoskrnl.exe: 3d27c> <ntoskrnl.exe: de72> <ntoskrnl.exe: e18e>
<ntoskrnl.exe: e753> <ntoskrnl.exe: 126c> ExceptionRecord->ExceptionAddress =
0xc0005c54 KeBugCheckWithTf at ke/catch.c:152 Bug detected (code 1e param 0 0 0
0)
KMODE_EXCEPTION_NOT_HANDLED

Recursive bug check halting now

Note that this does not happen always. Sometimes it crashes on boot, and
sometimes it seems to work fine.