I always wanted to write a topic title like that 
I have posted it to bug tracker.
As result of previous problem and seeing how it worked. I ended up with half a dozen stalled hipo jobs.
Could delete them all, except one became an orphaned hipo job which I can not delete, even logged in as root.
No error messages, it just refuses to die.
Are you running the Squiz Server? Your bug report doesn't say.
No, just a plain vanilla standalone install, straight out the box