A DUMMY COMMENT, and some promising results

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EDIT: ok, the following text crashed upon save:

OK, ( and ) and & worked just like that.
Also, the shorter copy & paste of the blog content went through. But the longer version crashed, although it doesn't have any < or > in it. But it had numbered lists like
1. first
2. second
3. third
done manually, without any html-formatting. Deleting those made it save without crashing.

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So, I'm starting to suspect that both < and a numbered list triggers a crash. One more test with just "1." in it, let's see what happens. If it works, I'll expand the list to see when it will crash.