Thanks for the report, JW!
I can't however reproduce your problem. In a few test games the autoplay worked for me the moment I had only Crowns in hand + non-Actions.
Please check first if the autoplay is actually set to "smart ask" for the Crown. Maybe you indadvertatly changed it when you wanted to change a different option.
There are a few situations where the autoplay doesn't work for technical reasons, but they are not due to the latest update:
1) If you have Villagers, the game thinks you might want to convert them to Actions, so doesn't auto-advance to the buy phase
2) If you have played Actions this turn and have a Coin of the Realm on the Tavern mat, the option to call the Coin will always be present. The Crown autoplay will not work, thinking the player might want to call the Coin.
If it's neither of those cases, then it looks like it's a bug, but probably only happening in specific situations. If you rememeber with whom you played or even the game number that could help finding the issue.