Some early builds had messed up buttons. I know of a few people that have had there end button fall off. Haven't seen a green buttom off though but definitely possible.
My green button is stuffed... It still works but part of the catch has broken and it's all wonky. Gonna get a replacement, but I'm gonna try and hole out til a new official OS is released.
My green button came off today as I popped it into the holster it caught on the lip and just tore off. Where do I stand with getting it fixed/replaced by vodafone. I could glue it back myself but I'd rather get it done properly..
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I have caught my buttons on a loose thread in my holster. I was lucky that I felt the resistance and stopped before I ripped them off. The plastic buttons are so flexible and I wonder why RIM opted for this type of configuration rather than four solid dedicated buttons.