This KDE Blogging application seems to be broken in RC1. I installed it from the repos and it seemed to go fine.
It starts OK and goes to set up Kwallet as usual, but when you get the next screen, to open the wallet and access the newly saved credentials, it fails to access the database and repeatedly does so on further attempts.
I tried removing all the related home directories for Kwallet and Blogilo and repeating the process, but the same error occurs. I'll report this on Launchpad tomorrow. I used to like Blogilo.