stefbv: DWIMPerl is not in the PATH (although a DWIMPerl installation exists on the machine).
Like I said in the OP, I went religiously through the Citrus Perl installation steps, including citrusvars.bat.

Here is the current PATH (newlines inserted for readability):

F:\Win7programs\Citrus\perl\site\bin;
F:\Win7programs\Citrus\perl\vendor\bin;
F:\Win7programs\Citrus\perl\bin;
F:\Win7programs\mingw64\bin;
C:\Windows;
C:\Windows\System32\Wbem;
C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;
C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;
C:\Program Files\Microsoft SQL Server\100\DTS\Binn\;
C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\VSShell\Com
+mon7\IDE\;
C:\Program Files (x86)\Microsoft SQL Server\100\DTS\Binn\;
C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;
F:\Win7programs\Python25;
F:\Win7programs\TortoiseSVN\bin;
F:\Win7programs\cygwin\bin;
C:\Program Files (x86)\IDM Computer Solutions\UltraEdit\;
C:\Windows\System32\WindowsPowerShell\v1.0\;

[download]

It refers to Citrus Perl only.
It seems like somehow CPANPLUS decided to locate its extraction top directory (tree-top) (for all Perl versions) below the DWIMPerl top directory.

But that is not supposed to influence installing modules.

In reply to Re^6: Citrus Perl: problems trying to load additional modules by HelenCr
in thread Citrus Perl: problems trying to load additional modules by HelenCr

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