I've noticed that occassoinally when I load a powerpoint presentation into openlp and then "go live" with it, the button to turn on the timed slides feature disappears. If I go into the options and uncheck then recheck the option the buttom comes back, but I'm just curious if anyone has any idea why this is happening. Also, for playing rolling announcements before the service, does it make more sense to setup the presentation to automatically advance the slides, or would using the Timed Slides feature of openlp make more sense?