Thank you Sean. Using percentages worked for the questionnaire items, but I can't seem to get it to work for the filler pages where I just have one line in the middle of the page between tasks. Can you take a look at the script below and tell me how I can center the line in the middle of the screen for any screen?
<item prerat>
/ 1 = "まず創造性テストから初めてもらいます。実験者の指示に従ってください。"
</item>
<text prerat>
/ items = prerat
/ hjustify = left
/ size = (90%, 60%)
/ font = ("MS Pゴシック", 25, 700, 128, 36)
/ position = (55%, 110%)
/ valign = bottom
/ select = prerat
</text>