A problem with Logexts.dll: "InjectionCleanup failed"

It is not a *kernel* debugging question but it is directly related to WinDbg.

I am trying to use user mode WinDbg and Logexts.dll extension to log
Win32 API calls from a service process. I am getting “InjectionCleanup
failed” error.
Here is WinDbg output:

ntdll!DbgBreakPoint:
77f43847 cc int 3
0:009> !logexts.logi

Windows API Logging Extensions v2.09
Parsing the manifest files…
Location: G:\Program Files\Debugging Tools for Windows\winext\manifest\main.h
Parsing file “main.h” …
Parsing file “winerror.h” …

Parsing file “dsound.h” …
Parsing completed.
Logexts injected. Output: "G:\Documents and
Settings\Administrator\Desktop\LogExts"
0:009> g
ModLoad: 50000000 50044000 G:\Program Files\Debugging Tools for
Windows\winext\logexts.dll
InjectionCleanup failed

Does anybody have any clues?

Thanks,
Dmitriy Budko, VMware