PS Deluxe v19.0.2.46. Created slideshow, 24 B&W slides, no effects, standard transition, single audio track. The time line looks correct, the audio track is lined up correctly. But when I play it back the slides play longer or shorter than the durations they're set to, and differ each time I play back the show. The slides don't transition with the scroll bar. The total time appears ok. The audio starts and ends correctly and is not intended to be synchronized with the show. Average photo size is about 47MB. I set the project for 4K editing. System info: Windows10; 64bit, 2.4GHz Quad-Core (7.8G RAM available); NVIDIA GT 650M (2017MB VRAM).