I found a bug in your revision 22.214.171.124 which basically requires a
digest-list directory to be located under the $listdir when it generates
the digest. This bug is mentioned in O'Reilly & Associates "Managing
Internet Information Services" book.
However, is not mentioned in the FAQ.
I modified two lines in the code which fixed it, but I am not sure if
somebody has already reported it/fixed it.
Please contact me for more details if you are interested or if you have
provided another "official" fix.
Taos Mountain Software