So, just to chip in.
I enjoyed Lars on the corruptions of insight, as weirdly enough I reread the quoted text just this morning. Mahasi Sayadaw identifies a brilliant light, strong mindfulness, powerful noticing, faith, rapture, tranquillity, happiness, energy, equanimity and attachment as ten potential corruptions of insight at the A&P. Not exactly the same list as the seven factors of liberation, but close enough. The reason they are corruptions of insight is that they can be mistaken for Path, when they are not Path. So actually all of these things are good and in fact necessary, until you think they are Path. Then they are corruptions. This seems more likely to apply before stream entry, as afterwards you know what a Path moment really feels like. Daniel has discussed this problem once or twice ...

However, Bardo Cruiser's question was subtly different, being about defilements that prevent a liberated state. This still crops up after stream entry, in relation to the fetters. That is, attachment to positive mental states prevents complete liberation, and can be detected in lust for material forms (e.g. rupa jhana), lust for immaterial forms (e.g. arupa jhana), and pride/ego. Getting rid of these defilements seems to be a very difficult lesson to learn. If you do get that suprising insight moment, then dive into it, wallow around, see how far you can push it. Squeeze the honey out of it.
In fact, why not look inside and ask yourself this question (but don't reply here). What
could possibly be wrong with bliss and rapture?
Malcolm