It works with the older firmware. Apparently the new firmware broke it and Green Address has not updated the app yet to fix what is broken.
it's ok now, the new GreenAddress version fixes that.
Been playing around with the newest greenaddress this morning and it works (version 0.0.66, downloaded directly from github).
After initializing with greenaddress, the hw1 then works fine in greenbits.
I then tried to log in with myLedger and it worked, but i think it uses a different address path.
Great, good to know everything is fine.
Some questions: are the greenaddress and myLedger accounts/ addresses using the same seed? So that if I wiped then restored the seed, I could restore my addresses and balances on both myLedger and green address? And is the security card used with myLedger separate from the seed and not reset when entering PIN 3 times?
yes to all of that. If you want to change your security card, you either have to reflash the firmware, or to use a user side function which is not properly documented yet -
https://ledgerhq.github.io/btchip-doc/bitcoin-technical.html#_set_user_keycard