Re:Wood Chips in food
I suspected something like this after I kept getting "bits" of something left in my mouth after eating some carrot cake squares brought in by a very good caterer that I use for business lunches in the office where I work. The odd things left had the consistency and texture of soggy paper that would not dissolve. I usually remove them with a finger and put them in the trash. They are very small and don't taste off, but they just don't dissolve like a cake crumb would.
It could be that the caterer is using a mix of some sort that is mixed in her kitchen and baked fresh. Other than this, she makes excellent baked goods, cookies, bars, cakes, etc. I'm debating about whether or not to say anything.