We recently discovered that due to a bug in Apple’s Game Center example code our games crash on devices upgraded to iOS 5 with Game Center enabled.
An upgrade fixing this problem is already on its way to Apple, but it will surely take few day to get approved. But there also is a temporal solution to play Neuroshima Hex & Neuroshima Hex Puzzle while waiting for the update:
1. Launch Game Center app.
2. Log out from Game Center.
3. Launch NSHex or NSHexPuzzle
You won’t be able to earn any new achievement or leaderboards points, but except from that both games should work just fine.
Sorry for the inconvenience and thank you for your patience and support!