I have two problems with the Toodledo on Google Calendar.
1. I have to login each time I click on the icon even though I have clicked on "remember me".
2. After I sign in I see the groupings "Today, Tomorrow, etc.". When I click on any of them I see nothing even when there are tasks that should be listed.
I generally use Firefox (Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:220.127.116.11) Gecko/2008070208 Firefox/3.0.1 - Build ID: 2008070208) although this seems to work fine in Safari.