Firstly, I myself have had funky problems with active section planes and scene pages (especially trying to animate the movement of section planes.)
Perhaps this might help:
Did you call
page.update(127), and then perhaps
view.refresh, after your previous code ?
Other then that, when you want help with code, it's best to post a method that attempts to do what you wish. Wrap the code snippet in lines of triple backticks (key left of the 1 key) and add the word ruby on the first line of backticks with no intervening space, ie : ```ruby