EmberJS doesn't render component/helper and no error messages in console dev tools

so this is my hbs tpl

the problem is on line which stops execution here, and I see no errors whatsoever in chrome dev tools console. The has no effect before this line, so it's somewhere else which may conflict with my older helper file, but I got it removed completely from app/helpers folder.

Before that I had a custom helper written myself with the same name, which I then deleted and installed the following lib

http://ift.tt/2qLlg2g

All other methods of the ember-string-helpers are working except for format-date

Any ideas why?

Also how to enable debugging (logging to understand what's the cause of the problem)? Right now it's total silence