I'm creating a project with some 75 slides, the background music works fine but no matter what I do, the View Slide Show simply won't work!

I've blocked all of the slides, gone into the TRANSITIONS and under the ADVANCE SLIDE have checked the box against the timer and set 00.15.00 (15 secs I assume) and then gone to SETUP SLIDE SHOW then chosen the ADVANCE SLIDES x Use Timings If Present and also tried each of the THREE SHOW TYPE x Speaker - Individual - Kiosk but get no slide advance on any of them after selecting view slide show option. I've also tried the Advance x Use Mouse Click selection but still no luck! No joy either on choosing From Beginning or From Present Slide.

I'm obviously missing something here somewhere! I even started a NEW totally separate practice presentation using pretend slides but same result, simply won't advance! Somewhere, somehow, I must have selected an option in PP itself that is overriding my selected settings..............?

Any help appreciated as it is driving me nuts!