Today I wanted to change a cron job from 30 minutes to 2 hours.

Instead of editing the current job, I copied from the overview screen in SiteWorx the current URL as displayed, deleted the job and added a new one.

SiteWorx said it had succesfully added the job, however nothing was shown in the overview!

It turns out that the URL shown in current jobs on the overview screen when I copied it, had a line break character, when pasted back did not compute.