Boneyard - Buy Gold bug and Sound bug
Two issues I've noticed:
1. This happens on Solomon's Keep as well. You can't buy gold more than once. Subsequeent attempts always result in the game crashing. I have the latest version of the Play store and have cleared cache in an attempt to fix the problem but nothing has worked.
2. Certain sounds don't respect the volume settings. Solomon Dark's voice is the prime example of this; he's somehow worked his magic to place himself above the volume settings that the rest of the game more or less follow. Other sound effects that don't seem to respect volume settings include the sound effect when clicking on the Get Gold button.