I attempted to remove an iPad alert from the website earlier today and found that I could not.
The combo box is being validated like you have the iOS check box enabled, but it is not. This keeps you from saving the form.
He’s a screenshot of the progression
Here’s how I started. The alert here is selected and there is a type of alert selection in the combo box “Meeting the flight”
http://www.icedown.net/bug1.jpg
In this shot I have unchecked the iOS check box. This automatically selected the top option in the combo box for that alert.
The box though is outlined in red, meaning a validation error.
http://www.icedown.net/bug2.jpg
This last screen I took right after I clicked save. It states that something in the combo box must be selected. It does not save.
Because of this you are unable to remove the alert from the website.
http://www.icedown.net/bug3.jpg
I was able to use the iPad to remove the alert though, so it seems that this bug is restricted to the website. I tried submitting the bug via email but all I got was a response back that there was not an iPad alert on my account…
I have replicated this bug in FireFox and IE.