Thanks, Cynthia. I've just spotted this discussion, which looks like a very similar problem. However, the solutions listed there did not work in my case (and my problem does not trigger unless I have both HTML destinations open at once). Seems like it's probably an EG problem. I was able to get around the problem by writing my report inside an ODS Document 'sandwich', and then using PROC DOCUMENT to replay it separately for each destination.
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