pack opening does not work if another pack is already opened
Tried opening some packs that had built up but after opening the first batch of Eldraine, I went to Zendikar and it still showed a pack of Eldraine down below. No big deal but after opening 10 Zendikar at once it would not let me open any more though I still had 7. I clicked on the Eldraine pack (even though it shouldn't have been there) and it did nothing but cleared the screen of the previous pack's cards. Then I clicked back on a Zendikar pack and it let me open it but not the next one. I had to keep going back to the phatom pack of Eldraine between each opening to open a pack.