Hey there chowhounds - you need to know this:
there is a nasty variety of pine nuts on the market that may or may not be from China, Korea or Vietnam (the jury is out) but if you eat them it can cause a VERY bitter taste in your mouth after eating anything, especially anything sweet, and the problem can last for over a week - in some cases up to 3 weeks. It is truly revolting and makes eating a real drag.
If you have the problem this blog has a lot of feedback from other sufferers:
the nuts look different - they are smaller than usual.
btw the only thing that tastes normal is water.
Here's hoping you dont get caught like I did!