Not sure if it 'should' behave as you seem to expect. If you have an animation on a slide, which you time to loop, it will not continue on the other slides. Can you give more details about what you want to achieve with that increment example? You have to be aware that the While loop cannot be stopped by a pause or a pausing point. If you have an interactive object on a slide, pausng the slide at 1,5sec, the incrementing will continue while the playhead is paused.