synchronizing via WebCalendar fails

Hi all!

First of all thank you very much for this great integrated calendar.
Lightning is very enlightening for me!

I am currently trying to sync my laptop with my desktop via
WebCalendar and it doesn't fully work. I am not sure if this is due to
WebCalendar or Lightning (.8)

WebCalendar officially offers the possibility to sync via ICS - you
are able to add, edit and delete events via client software. But it
only partly works with Lightning: I can add a bunch of events but when
I sync again I receive an error. At first I thought the invalid ICS
broke the sync:
http://sourceforge.net/tracker/index.php?func=detail&aid=1935981&group_i
d=3870&atid=103870

But now that the feed is valid the same happens:
[Exception... "Component returned failure code: 0x804a0107
[calIICSService.parseICS]"  nsresult: "0x804a0107
(<unknown>)"
location: "JS frame ::
file:///home/robert/.mozilla-thunderbird/08thcde8.default/extensions/%7Be2fda1a4
-762b-4020-b5ad-a41df1933103%7D/js/calIcsParser.js
:: ip_parseString :: line 58"  data: no]