Thank you for your bug report. It would be weird if the issue was specific to the snap, perhaps a problem from the new upstream version. Do you get any warning/error on stdout/stderr if you start thunderbird from a command line?
Could you also do $ journalctl -f and try to import the mbox and see if there is anything relevant logged? ** Changed in: thunderbird (Ubuntu) Importance: Undecided => High ** Changed in: thunderbird (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2064039 Title: TB Snap fails to import/display large mbox-file completely To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/2064039/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs