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Observations from an interview in Bakehila August 13, 2009 page 6 - (my translation)
1) "A large part of invalid geirim originate in Israel"
2) Regarding those who were converted by R' Druckman - "It is necessary to correct the statement that they were invalidated retroactively. There was no disqualification of the geirus. Does anyone really think the thousands of geirim from these special courts accepted to do mitzvos? Go and see that that the absolute majority continued to live as non-Jews immediately after the conversion. Even those converts who genuinely accepted to do mitzvos are in fact invalid because this beis din that they used was invalid. You will note that in the case that caused all the upset - the woman did not even observe the first Shabbos. Is this called conversion?"
3) It is only Reform and Conservative conversions which are not such a problem because everyone knows that they are not the paper they were written on. The real problem is the Orthodox rabbis..."
4) "It is not just once or twice but much more than that in yeshivos and Beis Yaakovs that it has been revealed cases of young people whose mother had an invalid conversion. The problem is revealed when they want to get married and they turn to us to examine the conversion. But how many cases are not revealed? From the time that kiruv organizations have done their holy work the numbers of these cases have constantly increased. This is also from baalei teshuva who come to marry with us and then it is discovered that they are not Jewish."
5) "In most cases where it is discovered that these people who mistakenly thought they were Jews we convert them secretly. However there have been cases of a young lady about to be married and it is discovered that her mother was not converted properly. So even though we convert them according to the halacha - but since the chasan was a cohen - the engagement is destroyed."