SPFolder.SubFolders.Add creates inaccessible folders and files

[Fess]

loading thousands of documents into MOSS 2007 using C# SubFolders.Add method
creates a folder and allows sub folders and files to be added also, but the
path is inaccessible with a browser as a SharePoint client. One exception:
I.E.6 in Explorer mode only.

The name of the folder: 2.2 ClassI-ClassII Tech.Files

Four levels down a folder hierarchy of 6 levels.

The only way to actually see the folder(s) and files below this "hidden"
folder is on XP (not Win2K3, or Win2K, or Win7) sp2 and only if I.E. 6 is
installed and then only using the Explorer view. The path status at the top
of the SP document library page will not show the folder or sub-folders, but
you can traverse these "hidden" folders and files only when using I.E. 6 in
Explorer mode. Search will not find the files, but you can iterate through
these invisible folders and files using SPDocumentLibrary foreach
SPListItem... so an inventory program can see the files and give you a
false positive, but they completely inaccessible except as specified above.

I am working on a very large document library load into MOSS 2007 from a
legacy document management system. This is the second time I have been able
to programmatically create a folder that MOSS 2007 accepted, but couldn't
actually use.

Anyone seen this?
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fb