Am in the old city. Just found corpse of NPC was looking for. Then head for exit. Can't exit city because Aloth won't move. Tried reload and save\reload. Can't dismiss or anything. Any ideas to get him moving again? Thanks

I have read that forcing him to attack something out of range will get him unstuck. I haven't had to try it yet myself though.

There are some glitches that are so annoying tbh. When I played this game the second time, before the glitch was fixed, I ended up picking a different character from Aloth because I didn't want to encounter this glitch! However, its fixed now so I don't have to worry. However, now I had to figure out the right combination of characters to use. If you are ever curious as to what companions are best, you can always check out a guide I wrote here
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Your guide is missing a few companions.