I forgot to mention that I could edit posts before (earlier today, in fact) but with the same browser I can't do so right now...

Interesting. What image extensions are you trying to upload, and what dimensions are said pictures? Also, what's happening when you are trying to Edit old posts? Does it take you to the rich text reply with your old message?

Heheh.  One problem fixed.  Apparently VGChartz doesn't understand '.jpeg', only '.jpg'

When I edit my posts, all I get is the blank space where the text input editor is supposed to be. 

Here is a screenshot of what happens - clicky

Nice.

Ummm ... when you get to that screen, try pressing CTRL+F5. Other than that, I haven't a clue as to why it would do that.

Still doesn't work

 Thanks for all of your help though.  I'll wait to see if it corrects itself....