I have google Calendar with Cal Dav in both Thunderbird and Evolution.

I can now not add to either calendar, and when I try and deleate the calendar, Evolution and Thunderbird freeze? What is going on here?

10.04 with all updates. Please help, I need my calendar!!! Everything worked fine as of this morning..... now nothing. And I can use Google Calendar on my Iphone and on the web, so it's something with my system.....