Let's see, the archmage bug so far is the only one people have found so I'm pretty happy with that. I decided not to go with the score since I never really cared for it. I found that people would have full points if they did everything right during the game.
You walk slower in your house and the shops because I used a lot of sprites in those locations, which slows things down for some reason.
I have no clue why the See Inventory item function doesn't work... I always thought this was a problem with the engine.
But for that and Fribbi's sound problem, you could try out this engine out:
http://www.agidev.com/projects/nagi/
It usually solves any problems. Dosbox should fix things too.
And for Fribbi:
[spoiler]There is a gem in these locations:
1. The troll cave.
2. The hole in the ground with the ladder.
3. Past the swamp in the fallen log.
4. Past the fire.
5. In the blue monster's den.[/spoiler]
You can place the gems in the monolith any time you want as long as you eventually place them all.