I found a mention of a patch V1.02 and it said for PC that you had to have this patch or you can not finish the game as it allows Indie to move up and down vines and to turn while on them. I have not found a download site for V1.02 and if it is 13.2MB, I'll be downloading all night at 28,800 connection.
I am having a problem with vines. Indie will not swing while on them. I did rebind my keys to use the arrows instead of W,S,D,A. These are the keys to use to make Indie swing but my arrow keys only make him climb up or down.
I'm finding the keys and buttons in this game (and most of the newer games) to be very cumbersome. No matter how you rebind your keys, you still end up taking your hand off of the mouse sometimes. The old Tomb Raider controls were so nice...sigh.