This has been true since I joined PF about 5 months ago. My posts cannot contain any extended ASCII characters, whether I type them in or quote another post that contains them. If one does slip in unnoticed, then the message appearing on PF is truncated at the first such character, omitting that character and everything following. I can insert such characters while composing the article, and it's usually only when I view the actual posted article that I realize I inadvertently included an extended ASCII character. Then it's too late, and most of my carefully crafted message is lost. It's lost because I always forget to make a copy (using the mouse) before I click on Submit. If I wish to quote text that contains an extended ASCII character, I must delete that character or change it, e.g., change the rho character to a "p", or change the Pi character to the string "Pi", or else resort to itex. Any idea what is imposing this restriction? I'm using Firefox 3.6.9 on Linux. I haven't tried any other browser. The restriction is not exactly crippling; I'm managing to live with it.