The issue that caused him to leave was his reaching the conclusion that he could no longer believe in Sola Fide and Sola Scriptura, the pillars of the reformation.
On the Called To Communion blog, he explains in detail his reasons for leaving and for joining the Catholic faith. Most of us had assumed he would become Catholic but his post on CTC confirms this. It is important to realize he graduated from the most conservative confessional reformed seminary in the country with honors and was an author and well-respected in the reformed christian community. Therefore the claim that he never understood reformed theology is baseless. He also harbored no hidden Catholic sympathies either and he was not a "Catholic in Protestant clothes."
Read his story here.
"ADDENDUM: FOR PERSONAL REASONS JASON DECIDED TO TAKE THE POST DOWN ON CALLED TO COMMUNION AND HE WILL PUT IT UP AGAIN AT LATER TIME. PLEASE KEEP HIM IN YOUR PRAYERS."
