One thing that messed me up once is right-clicking on a posted image and getting the proxy URL, which tries to proxy the proxy & breaks stuff.
Easier to show than explain: I'll reight-click & save the (sloth?) pic, and get this: https://ip.bitcointalk.org/?u=http%3A%2F%2Fi.imgur.com%2F9WbAL.gif&t=535&c=U9ut3HgxwLZ8uw,
which shows up as:

*Not a complaint, just a heads-up, etc., etc,

Happened to me too, lol. You can't do anything about it ;P

You can get the url with quote