I'm having a problem subscribing in Google Calendar too (yes I have private urls turned on).

I logged out of RTM and tried to subscribe to my ical feed in Microsoft Outlook; but it brings up a login window -which shouldn't happen with a private url.

My events show up now (of course, after I post about it!); though I have yet to see them update.

I wish that RTM would show tasks with due times IN the calendar though, not just through that little blue button.
Oh well, maybe in the future.

you can subscribe to the task list webcal link ... but syncing work bad ....

If anyone is still experiencing this problem, it might be worth contacting Google Calendar support (iCalendar is fine on our end, so it seems like they may not be updating properly).

Hope this helps!

Jesper.Bylund - please take a look at this: "How do I subscribe with Google Calendar?"
http://www.rememberthemilk.com/help/answers/icalendar/googlecalendar.rtm