WordPress crontrol plugin

I'm trying to use this plugin to test an email process I want to run every week.

See attached. I created this, I clicked "Add php Cron Event". It showed in the list.

I did not get an email. I clicked "edit" in the Cron Events list, the code is gone.

I have two other php cron events that run as scheduled.

I'm guessing it can't find php mailer because that class is at the site root. But why does it just disappear?

What am I doing wrong?
crontrol2.jpg