"I know this is an old thread, but I too am having this issue (along with other issues): Master slides not showing in preview or after ..."

"Thanks Amanda, Coincidentally, this question was replied to and appeared under my post. It's essentially the same question, and it has s..."

"I'm not sure if there is a post or article already about this, but.... If I Sync Animations on a slide for, say, 12 seconds, then decide ..."

"I've noticed this a few times, and generally it's not a problem, with a short workaround. Occasionally, I'll attempt to open a .pptx file..."