I noticed that if I was 7 levels higher or more than the monsters that I was killing that I would not receive any exp pts. For ex., if I was level 20, I would have to kill a level 14 or higher monster in order to get any exp pts.
If the items that are not showing up when trading with a merchant are labeled Unique in green than you won't be able to sell them until the next act. I know it sucks, but its only a minor nuisance. Just leave them in a battlefield barrel by the merchants until you're ready to proceed to the next act.
On 2 occassions, I also experienced losing a weapon when I was changing my gear. What happened was that I temporarily lost the requirement to yield that weapon while switching items. One time, the weapon disappeared, but re-appeared when I switched my gear back to before the change. The other time, I lost the item, and had to reload the game. My best advice is to keep multiple saved games, and at the very least save the game every 15-20 minutes in case something goes awry.
Now go slay some monsters! <img src="/ubbthreads/images/graemlins/cool.gif" alt="" />
