Thanks for catching this. Once you clicked into the Quest Log search box, clicking back on the game didn't release it, so your movement keys kept typing into the box and your character couldn't move. Now a click anywhere outside the box steps you out of it, and whatever you typed stays there. Click back into the box to keep typing. This also covers the storage search, buddy/guild name boxes and the shop chat. Live now: open the Quest Log, type in the search, click the map, and you should be able to walk right away.