Bad drag and drop response of send_mail function in Custom Functions creation

When I drop the send_mail function in the CRM custom function creator interface, I get a 2 popups saying invalid. I can then no longer edit or submit the form for setting up an email. Tried on both Chrome & Firefox. See error message below:

To recreate this error:

Goto:

https://crm.zoho.com/crm/ShowSetup.do?tab=automate&subTab=workflow

Then:

'Custom functions' tab

Then choose:

'send_mail' function' click edit (a few times)

From the deluge screen you click on the pencil to edit the Sendmail parameters and it pops up two errors (undefined,undefined)

You're then unable to submit or click 'done' on the form.

1. Refused to set unsafe header "Content-length"

homepage.js:7

1. POST https://creator.zoho.com/scriptPopulateXML.do?&zohoaccess-appid=1450584000000014003&sharedBy=25812027&zohoruntime=1391008597087 500 (Internal Server Error)