bronko: Never had one blow up on me (nor do I see how gluing something to the inside of a nock would cause it to blow up). However, if I don't roughen the inside of the nock sufficiently, the rod will slide out after a while. When that happens, I can hear it rattling.
It could possible be the material used to make the lighted nocks vs. those used for std nocks are different. Or possibly the one that blew up on me had a crack in it and the extra weight caused it to shatter upon release.
I know it was a harrowing experience. I thought I destroyed my bow.