I still think that there's smth wrong with your openning book, because making sudden and random moves, or freezing up is mostly due to the missing or altered movement lines in the books, as i've stated before. When your engine can't find the necesaary movement line in the book, it tends to make a random move, pls try using this book without making any alteration on it, this is the original book of Rybka, this is Rybka II.ctg:
http://www.rybkachess.com/download/RybkaII_final.zip
Try this book and if you still encounter with the same prb, simply let me know










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