Hi,
I've been playing around with the source code, and I think I've found the source of this bug (I happened to have the same problem). My computer has the french version of Windows 2000 installed. The UnixParserFile tries to parse the dates according to
CultureInfo.CurrentCulture
(in French then), though all the FTP servers I know give dates in the English format (there's no such month as "May" in french, it rather is "Mai). Replacing the occurences of
CultureInfo.CurrentCulture
with
CultureInfo.InvariantCulture
solved the problem.
Hope it helps.
Mac