To turn on in-app purchases, go to Settings -> General -> Restrictions, at this point you'll need to enter your pin. This is a bug and we expect to fix it in our next release so that Flow won't crash in this scenario but you'll still need to enable purchases before you can buy a level pack. We've seen this happening when in-app purchases are disabled. If you're still seeing a crash trying to make a purchase, let us know. It was caused by a problem handling the case where in-app purchases were disabled.
Update 7/28/12 - This issue should be fixed in version 1.2. I'm trying to purchase a level pack but Flow keeps crashing, how do I fix this?.
This is something we've seen come up a bit and it's definitely on our potential feature list. Right now progress is only kept locally so it will not sync between your devices. If I play Flow on multiple devices, will my progress automatically sync between the two?.Hit the home button again and restart the game. To reboot the game, double press the home button, you'll see a set of icons on the bottom of the screen, tap and hold the Flow Free icon until the icon starts to wiggle, then press the close button in the top left corner of the icon. We are looking into what causes this but usually the game just needs to be rebooted. I've been playing for a while and the sounds stopped working.
After that any level packs you previously purchased will be downloaded to the device. You will see an Apple dialog appear and will need to type in your iTunes password. The simplest way to do this is to go into Settings and click "Restore Purchases".
Thanks for your support! You can download any purchased level packs onto all devices under the same iTunes account at no charge. Is this possible, will I be charged twice?
Flow Free version 1.2 for iOS and version 1.4 for Android were released earlier this week.