I crashed to desktop either when I got too near the chest OR the cursor went near it. (Not necessarily OVER it - just NEAR it.)

That was basically the last thing I had to do in Act II. I moved on to Act III.

I have several things left from Act II, a big disappointment: the Imp wouldn't take the Potion, so I have that. The "special spider" never appeared so I have the creams. The "mummy" wasn't there (or maybe I missed him - by that time, I was a bit disgusted).