I've found a difference between the account that works and the one that doesn't. The account where Thunderbird crashes is an LDAP account. There are no local entries in /etc/passwd. Instead, the account is managed via nss_ldap.
If I add the account to /etc/passwd with the same information as in LDAP, then it works.
With Karmic and Thunderbird 2 it did work without the entry in /etc/passwd.
I've found a difference between the account that works and the one that doesn't. The account where Thunderbird crashes is an LDAP account. There are no local entries in /etc/passwd. Instead, the account is managed via nss_ldap.
If I add the account to /etc/passwd with the same information as in LDAP, then it works.
With Karmic and Thunderbird 2 it did work without the entry in /etc/passwd.