Please note that THED does not currently work if you are using Firefox.
Firefox has implemented the Content-Security-Policy which prevents all inline javascript from running, which THED uses for the button clicks. It will be a little while until I get around to fixing this issue, so please use another browser in the interim (both IE and Chrome still work OK).
I will post here when the issue is fixed. Apologies for the inconvenience.
Snowman
Just a quick note to say that this problem seems to have gone away!?! I am not getting problems on Firefox (31.0 or 32.0.2) under Windows 7 any longer. Maybe this was a particular version issue, I dunno. If anyone does still receive issues using Firefox (or any other browser) then please comment here or email me.
~ Snowman ~