Results of Input text box trace as HTML - please NOOOOOOOOO

AT school we're using Flash CS5 to do some basic ActionScript 2.

Some students are finding when they insert an Input text box, that the results of that input  box trace as "rendered HTML". Pretty annoying when you're expecting a string or integer.

We've checked that the button to choose "render text as HTML" is not checked.

Is there a fix - we're now in Assignment mode, and I need to find a work-a-round for them. It doesn't have on every work station.

Paul