Can't email 'ibles! Answered

I surf Instructables a lot at work, during down-times (gotta love IT, when your servers are humming and users haven't managed to screw things up in awhile), and will often email my wife, myself, or friends interesting 'ibles.  The last couple of days, however, when I click on the Email button, the window pops up as usual, but after filling out all of the requisite information, clicking the "Send to Friends" button at the bottom does nothing.  Not even a hicup.  No blinky lights.  I'm using XP Pro SP3, Firefox 3.6.8 (updates were the first thing I tried).  Any thoughts about this?