Youtube in a Placeholder-No Regeneration then Crash

[Vortilon]

Hello all, I'm having an issue with embedded YT videos. My process is this:

Create a placeholder (rectangle with the Shape tool).

Right Click>Web Properties>Placeholder tab

Click HTML Code (Body)

Paste in the embed code I got from the YT video

OK.

Placeholder is black, program happy.

Back to the placeholder edit screen and tick the "regenerate placeholder image automatically" box.

The Windows wheel spins and spins and spins, and at the bottom of the XWD screen I see the "Generating HTML Preview Image" message.

After around 30 seconds, the program shuts down.

If I don't tick that Regenerate box, and then do a page preview, the YT eventually appears in the placeholder. I just can't see it on the edit screen.

The odd thing is that I inserted a few YT videos into a page yesterday without issue (they all have "regenerate" ticked), but today, I can't do it.

This is annoying because I can't see what's in the placeholder.

Any thoughts would be appreciated.

Edit: I've just edited the embed HTML on one of the placeholders from yesterday and now I can't OK out either; the same Generating HTML Preview Image message at the bottom and eventually the program crashes.