It always has done (at least during the year I have been on here). If the whole post is in capitals, then the software assumes it is a mistake and converts it. If the post contains some lowercase type as well, then it is left alone.
I was wondering the same thing myself, I typed a reply in Boo's birthday message to Estie thread, in capitals and it all came out in small letters. I'll remember not to do that anymore... :(
Aahh!!......thanks Eddie...that's exactly what I did left the "Caps Lock" on as I wanted the message to be in capitals and thought it would come out like that. Thanks for clearing that one up.
It's always been like that, as gen says, if you type it all in capitals it thinks its a mistake but if you put even one word or letter in small letters its fine