Still experiencing this issue. Works fine on jmonkeyengine.com, which doesn’t run BuddyPress, but jmonkeyengine.org, the BP-powered community site, keeps doing the redirect.
On our test site, a snapshot copy of our live site, I tried the suggested trick of changing the theme to TwentyTen and then activating: It works. Thing is I really don’t understand why this is, and I would feel a lot more comfortable using JetPack if we were able to activate the plugin on bp-default (of which we run a childtheme) as intended, rather than some mysterious workaround.
Does this change-of-theme activation trick mean a plugin is not at fault here, or could it be that a change of theme simply blocks out the conflicting part of the plugin? I’ve tried disabling the usual suspects with no luck. I’ll try more later, but right now we need all our sites running to test another feature.