I read a disturbing article by Rav Menahem Eizenberg in Techumin (26, page 123). The one of the many issues raised in the article is that the hechser for machine mazah does not apply to today's machines which are very different that those delineated in halacha. Specifically, today's matzas are baked for two minutes on a conveyer belt that begins on a very low temperature (Hand matzot are baked in a very hot oven for 15-30 seconds). This process he claims, and goes on to prove quite well in my opinion, causes the matzots to be chametz beyond reasonable doubt. Tchumin has another article, which is a letter of endorsement of this article from Rav B"Z Yaakov Vasner who basically says: machine matzah is chametz. So my question is, do you know of any literature on the subject (this was written over 15 years ago). Do you know any other opinions that argue this case.
Here is the full article: http://www.zomet.org.il/?CategoryID=257&ArticleID=321&Page=1
Here is an insufficient response i found: http://www.zomet.org.il/?CategoryID=257&ArticleID=322&Page=1
I spoke to Rav Machpood* last night. He thinks that the fact that the matzot are in the oven the whole time is enough. but if you look in the article I think he shows that that is an insufficient argument.
[*] A very big rabbi in the Kashrut sector in Israel: http://he.wikipedia.org/wiki/%D7%A9%D7%9C%D7%9E%D7%94_%D7%9E%D7%97%D7%A4%D7%95%D7%93