I have been running Ethereum Wallet for some time now and have used drag and drop to enter contract address for the ERC20 tokens that I watch. However, I have downloaded the Mist app. and have tried to drag and drop the contract address for the watch tokens and it keeps changing to the Ethereum Webpage instead of remaining on the token contract page. Therefore, it is impossible to drag and drop. I also copied the contract address and it will not allow me to paste a copy on the token watch page. How are you guys doing this so I can play too?
Thats odd. It its working fine for me. Head to https://github.com/ethereum/mist and you might find something.