Yeah, same here, using Firefox 3.5.1 in XP PC - but even when I typed it in it showed up as the text, not a spoiler box, so went back & edited/erased it. The button is still gone. Figured it was either probably just a computer glitch (since that's normally what it is, rather than a bug), but maybe the newest version isn't *quite* compatible in some way. Hopefully it'll get ironed out soon!
Grrr ... I don't *think* I missed something in the code?? (my husband's the enginerd, not me!)
OK, just so *everyone* doesn't bug our wonderful admins, I did PM rookie about the spoiler thingy. So the 'powers that be' should be aware!