I had the same trouble when I first tried the game - it was very discouraging at first - however, something very fascinating occurred to me when I was picking out the words - I was visualizing where the word would be on the page(and in my mental picture there was a big bold Bubble letter B - representing the start of the letter B on the page in my mental image) but the word was not there. Then it hit me, my mental image was not from the dictionary that came with the program! I went to my shelf and pulled the dictionary and opened to the page that I had imagined in my mental picture - thus, I had recalled the word from a different dictionary.
I had not photoread the other dictionary - however, in imagining the page I was using my subconcious mind which gaave me the aanswer (just not the one I was looking for - laugh). So, do not be discourage if you pick words that are not in the dictionary you photoread, you are likely pulling from any of the dozens of dictionaries you haave looked up words in during your lifetime...