<<Disclaimer:  Verify this information before applying it to your situation.>>

> Does xanthan gum need to be stored in a special way--does it go bad
> quickly?  I put mine in the refrigerator after opening--could this be the
> problem?

I believe Ener-G Foods recommends keeping it in the frig.  Is it in an air
tight jar?  If not, it has probably absorbed all the refrigerator odors,
just like a box of baking soda.