Same here - I never had this problem under 11.04. After upgrading to 11.10 I get "There was a problem opening the address book "Ubuntu One" - the message returned was: Cannot open book: Cannot process, book backend is opening" right after starting Thunderbird 7.0.1.
Same here - I never had this problem under 11.04. After upgrading to 11.10 I get "There was a problem opening the address book "Ubuntu One" - the message returned was: Cannot open book: Cannot process, book backend is opening" right after starting Thunderbird 7.0.1.