Poor Jennifer Garner has been hurt during a stunt in an episode of her TV show Alias, she's suffered nerve damage. This is apparently the actual explanation for her recent non attendance at various promotion pieces for Elektra. IMDB have it with:

hThe actress pulled out of promotional work for her new movie Elektra last weekend amid reports she was pregnant with boyfriend Ben Affleck's baby. Her aides insisted she had a viral infection and was trying to recover in time for this Saturday's Elektra premiere in Las Vegas. But now it seems Garner was struck down with a nerve problem resulting from a stunt she performed on the set of her TV show Alias. An insider says, "We all thought she was suffering from a viral infection, but doctors concluded that it was more. Under doctor's orders to take it easy she had to cancel a hosting gig on Saturday Night Live and the film's press junket."

Best wishes and thoughts with her to get better, especially from John who would like to attend a bedside vigil.