Question:
I got swing wallet. I want to send some Zen to bittrex. First 0.2 Zen to test if it's all fine then more. It displays the message (in 'send cash' tab) that remaining unspent Zen in T address will be sent to auto-generated address. How does this work? I'll send 0.2 zen to exchange and then the rest to some random new address (that will get private key I assume)? Can I then send the funds back to my original address? (I have it's private key backed up)
I tried to look it up and watched some videos but I didn't fine anything conclusive. And links about the issue are appreciated.
Ohh and the logo has just been updated on CMC

This newly created address is in your possession and you can get private key. This is good security practice, sometimes looks odd, but you have control over your funds all the time. Yes you can sent your funds to previous adress after transaction is confirmed if you like.