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Good catch! Just tried it on Win CS3, and indeed, if fill opacity is respected, channel unchecking is not.
Which group property does not follow? I don't see a difference in your screenshot, and tried adding blend effects as a group, and it stuck between the depth change.
Sorry, I should have posted a screenshot for the Group Properties – a Group’s Group Properties that is – if I turn off one channels there that also is lost.
I moved it to the enduring forum. According to: http://feedback.photoshop.com/photoshop_family/topics/lost_channel_settings_in_group_prope rties_and_blending_options_when_switching_to_or_from_16bit
the behavior is now correct with CS6.