For reference purposes:

I sent the appropriate files over to Richard, which he's looked at. He emailed me to tell me he'd found the bug:

The bug happens when an event is added that initially has the event trigger set to 'if event not happens'. You have a Chain event, chained to a Chain event with this trigger. When I highlight the chained Chain event, then press Insert, the new Chain event has this trigger too. The insertion code resets it to a default trigger, but doesn't adjust pointers to the event chain which follows.

Richard said that a fix will be in the next release.

Cheers Richard!

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