Hitting reply isn't the thing, it's hitting quote. That's how I figured out the last one. I haven't done that, but it's difficult trying to figure out how you created a puzzle that isn't visible. lol The last one was invisible because you chose white as your text colour.

I thought something might happen if I refreshed, but that didn't work.
I figure it's got something to do with either perspective or refresh but I don't know. I'll try to think about it. try being the operative word.

The only other thing I can think of is that you've created an image and changed it offline or removed a link or something.

Don't tell me!!!

I thought it might have had something to do with the message editing format, but I'm still checking that out with my control panel.