Anyone use the davical library?

Trying to use DAV to write Yahoo calendar events. I am using the davical library DLLs.

I can access the ICalendars collection using proper calendar URL, but it always comes up with a count of 0. I have tried on two different Yahoo accounts, both with publically-accessible calendars, with the same result.

If the URL is incorrect the ICalendars collection comes up as null, so (with the correct URL) if the collection is there simply empty I am pretty sure it's accessing the collection correctly. But why a count of 0...

Any help is appreciated.