Some versions before 5.34.0 will crash if view layout in Deck Builder is set to Grid and there are more than one deck types in the list.
It works ok in List (table) view layout, so either access your decks from CardView directly and wait for 5.34.0 App Store update which will fix this issue, or reset your settings in Main Menu -> Settings -> shake device to get to Shake Menu -> Reset to Factory Defaults. If you reset to defaults, current versions will also require restart of the app or manual refresh of currency in Main Menu -> Settings (this is fixed in 5.34+) to get the prices to display properly.