You don't have to remove buttons, only take out their pausing. In CP9 that can be done with the Timing Properties panel for buttons on the slide, or on the Actions tab for shape buttons on the master slide.
If the slides are still pausing, can you check the Slide events: On Enter/On Exit. Maybe they have the action 'Pause'?
Moreover, buttons are not the only interactive objects that are able to pause the slide: I mentioned Shape buttons, but Text Entry Boxes, Click Boxes and Interactive widgets can pause the slide as well. Question/Score slides have a pause built in (visible on the Timeline) as have Drag&Drop slides (invisible on the timeline).