Portable Update file name database fails / Update MiKTeX fails

Hi all,

I just did a fresh install of MiKTeX portable
(miktex-portable-2.9.6361.exe) and successfully compiled a document
(pdflatex). Doing this, MiKTeX automatically installed missing packages
on the fly.

Just after that I tried to update the installation. This led to the
following error message. An update of the file name database shows the
same error.

Any help is appreciated!

Regards,
Henning

MiKTeX Problem Report
Message: Invalid argument:
path="H:\Tools\MiKTeX\texmfs\install\miktex/data/le\mpm.fndb"
Data: path="H:\Tools\MiKTeX\texmfs\install\miktex/data/le\mpm.fndb"
Source: Libraries\MiKTeX\Core\File\win\winFile.cpp
Line: 493
MiKTeX: 2.9
OS: Windows 7 Professional, 64-bit, Service Pack 1, build 7601
Invokers: miktex-taskbar-icon
SystemAdmin: no
PowerUser: no
Root0: H:\Tools\MiKTeX\texmfs/config
Root1: H:\Tools\MiKTeX\texmfs/data
Root2: H:\Tools\MiKTeX\texmfs\install
UserInstall: H:\Tools\MiKTeX\texmfs\install
UserConfig: H:\Tools\MiKTeX\texmfs/config
UserData: H:\Tools\MiKTeX\texmfs/data
CommonInstall: H:\Tools\MiKTeX\texmfs\install
CommonConfig: H:\Tools\MiKTeX\texmfs/config
CommonData: H:\Tools\MiKTeX\texmfs/data

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