I'm having the same issues (Chrome on Vista and Win 7), though I can copy and paste from plain text mode to the WYSIWYG mode if I reload the entire page first.

Did you clear your cache? I had a similar problem.

Perhaps GameDev.net should put a message across the top of the site saying, "We just updated our site software. If you are experiencing any problems, first try clearing your cache; if the problem persists, report it [here]"

I imagine quite a bit of people are experiencing the problem and don't know why.

[Edit:] Currently it says, "Ctrl+R your browser". Refreshing the webpage (Ctrl+R) won't fix it: clearing your cache does.

I cleared my cache. Still no luck. I had to edit a post about five times and it still doesn't look correct.

I using Chrome on Windows 7 Home Premium 64-bit.

I cleared my cache. Still no luck. I had to edit a post about five times and it still doesn't look correct.

I using Chrome on Windows 7 Home Premium 64-bit.

Hrmm.. I had to press the plain text mode button in the upper left corner to modify your post correctly. I don't like how if you put two source snippets you can't get back to post something between them.