At least with the disk version the dawn/dusk effect can sometimes be gained/lost by re-installing the game or by installing a patch.
Edit the '..\Divine Divinity\Run\config.lcl' file in notepad (or any other text editor), add the line "splotchproblem 0" to the end, hit enter (the game expects the last line to be blank) and save. When you start Divinity and load a save, the dawn/dusk effect should hopefully be restored.

The two tavern pieces were the only music in DD I didn't care for. I don't know if there was a change in, or problem with, the download version.

I have not heard of anyone else automatically heading towards the orc drummer after teleporting. I had to skip him myself until I leveled and got to an area where I could get a better weapon (he couldn't hurt me, and at first I couldn't do damage faster than he would heal himself).