The shuffling algorithm for 2-decks games (such as Spider) has been improved: the previous one shuffled decks independently, thus favouring the creation of easier than average games.
If the last used deck cannot be loaded at startup, Wiz Solitaire will revert to the standard deck, after notifying the user.
This change will fix a freezing problem reported by some users when the game was first run from a mounted .dmg volume and later from the Applications folder.
On a side note, Wiz Solitaire is now listed on iusethis: if you've got an account there, please add it among your apps.