According to his personal Twitter account, Woe, Is Me touring guitarist Geoffrey Higgins is no longer in the band.  Earlier today, he tweeted:

"For anyone who is wondering and has been asking, I quit Woe, Is Me because of musical differences.  I am more into softer indie rock."

Higgins had been touring with the band since March 2011 as a fill-in for guitarist Tim Sherill, whoe left the group in December 2010.  Through a representative for Woe, Is Me, vocalist Tyler Carter said Higgins was only filling in temporarily on Warped Tour; the band hasn't yet found a permanent replacement for Sherill.