Upgrading Flickrstickr

I'm working on converting Flickrstickr from a 4.7.x module to a 5.x module. I've got the module to the point where it's displaying images for only the logged in user (yay!). Unfortunately when I try to drag and drop an image it is not (1) pasting the URL back to flickr (2) displaying the correct size of image. I assume this is a problem with the javascript functions, but I'm not sure where to start.

If I have TinyMCE enabled and I drag and drop this is the HTML that is pasted into the text area:
<img id="flickrstickrphoto3" style="display: inline" src="http://static.flickr.com/1334/571500480_6f4832f271_s.jpg#left_240_240" alt="" />

If I do not have TinyMCE enabled and I drag and drop this is what I get:
http://static.flickr.com/231/470018726_fb987ae648_s.jpg#left_240_240

Strangely (at least I think it's strange) there do not appear to be any javascript errors when I type, "javascript:" into the address bar in Firefox.

Has anyone else seen this kind of behaviour in previous versions?

Your help would be MUCH appreciated. :)