I was just going to say (But you beat me to it) This isn't because of the fix it's a long standing design feature (bad design)

You need to either

Make the slide with the video a one slide custom show and link to that.

OR



Insert a blank slide just before that slide. Set IT'S transition to auto zero seconds and make the link to this slide.

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Microsoft PowerPoint MVP 2007-2023
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Thanks Again John!!!!

That blank slide fix also works a treat!!
I could even have the Clip title on that slide before it starts.

I'll also have a go at the Custom Show later see how that goes!

If Your ever in Alnwick Northumberland check out the Bailifgate Museum, that's where the presentation is headed!!
...they owe you a coffe!!! (at the very least!)

Cheers

Colin