Guild Wars 2

I am working on taking my alts through map completion. With the last 2 I have taken through this quest each time I successfully create a potion and Cesselaia tells me to use it on the spider my character is locked in position and cannot move to the cage. I end up wasting the potion and in fact have to go to character screen and log back in to have my character move again.

Same here. No one I know can make a potion without becoming stuck in place.