Hello again David,
I had another look at the hbs player and found the cause of why it as not being inserted. QuizPort assigned the same ids to both the non-standard players, so only one of them was being inserted.
I have fixed that now and it is now possible to use the [square brackets] notation to insert different types of player into the same quiz when the "Use media player" setting is set to "QuizPort media filter".
any further problems or if any is not clear, please let us know!