I really liked the "view message source" feature, and now it's gone...
If I understand you correctly, you can use the Quote facility to see the contents/[abbr="bulletin board code"]BBC[/abbr] of a message.
Doesn't work if the thread is "locked", though. And it doesn't work on "quotes" either.
an example:
Try using "Reply with quote" on my message; then you'll know what happens.
_