also can you make a second purchase?
Yes, just click on "New Exchange". For me BTC worked fine today, except for wallet synch'ing. Sending BTC to Lisk was "fast". All confirmations within 30 minutes.
There were complaints that the Bitcoin network has been a bit overloaded at times today. If you pay a high fee you should get your transactions through fast, but you might have a delay if you pay a low fee. Often you have no fee size control if sending from an exchange, but you can decide the fee you pay from your own wallet.