So I've collected 100 pieces of scrap metal/tin cans, I return to the Gun Runners, only to find that Isaac's no-where to be seen. Where's he gone? Has anyone else had this problem?

A frustrated 360 player.

He has a house straight east from Gun Runners.

Just keep walking East from the gun runners hut, it's a good bit away but he's in there if he's not out front.

He was never out front in my current play through, I thought he disappeared, too.

Great, I found him, ta very much.

(Was a bit odd mind, when I went in his house I couldn't find him, but when I left again he was sprinting down the road and I had a real struggle to catch up with him. Peculiar.)

Thanks again.

He did the same thing to me, haha.