A600kgBear – I had the same problem with K9 when I downloaded Internet Explorer 8. In the end I reverted to version 7 because my K9 is more important than the upgrade.
BTW – important note about K9. If you forget your password you can have it sent to your email address. If you think anyone else may be logging in and having it sent to your address when you aren’t around, do what I did. I set up a new email account with hotmail. Put this down as my email address, got the initial emails then deleted the account. This means that no-one can get into it. HOWEVER, one draw back is that it does not recognise hebrew, which means that occasionally things can get past it.