Unfortunately, I can’t provide support for Macs as I don’t have one myself. All I can suggest is playing around with settings.
Hm. Are you playing on a Windows PC or a Mac (via Wine?). I know that sometimes happens on Mac installs, but I’ve never heard of it on PCs.
You’re doing nothing wrong. The arrow tool was only available in the Tina section. You’ll get it back later in the game and be able to revisit the area to collect the items you can’t get now.
The weapon store in Bordertown should have both.
You receive them all.
Sounds like you’re in the south of the mines. There’s a north entrance.