Ra9000: SeeDMako is right.
when I saw playthrough video on youtube, when you exit from Inn, Old man with robe begin speak to you and give you quest. From me nothing happens. I can only exit town, go to the Armor, Inn, Church and Tavern. Other building are "locked" that means even if I go with my cursor on building it is not highlighted. If you check folder townavi and townmsk1.avi, you will see which building you can enter.
This is then unplayable game because you didn't get main quest and you can not enter to building get other quests or class specialization (for example mages).
If you press revert game the quests are reseted but your companions are preserved in the inn with exp and equip, except special items, intact and once you exit inn the animation should trigger. This worked for me.
About the avis there was a very known bug gog has not fixed. The avi archives must be changed for decompressed ones.