But on further investigation… You were right, Rich. There was a mistake in the "embed" macro. I'd missed off the closing dollar sign of "$start$" and "$end$". This was causing the "youtube-embed" JavaScript macro to receive the strings "$start" and "$end" as its parameters, wreaking havoc.
Bizarrely, "embed" was still embedding a YouTube video that played the expected section when clicked. At least, it was for me. I don't claim to understand that. I've uploaded a corrected version to TiddlySpot. – æ -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To post to this group, send email to tiddlywiki@googlegroups.com. Visit this group at http://groups.google.com/group/tiddlywiki. For more options, visit https://groups.google.com/d/optout.