Having the same problem with all three of the families iphones. Worked at the start, and then stopped working. Worked great prior to 4.3.3. Hopefully an update will fix the problem. All we can do is wait.
I realize this is a few months old, but this is still an issue. I'm not thrilled having had this problem for this long in an app thats paid for. If you want to charge, you should be supporting your product alot better than this.
Thank you- I was beggining to think i was the only one with this problem. I am guessing thou that this problem is only on the IOS 4.3.3, but my 3GS running on 4.2.1 crashes when I install... I'm using Haptic/ vibration old on 4.2.1 and it works well...
I downgraded my ip4 from 4.3.3 to 4.2.1 to get HapticPro working again. I need haptic feedback. Hopefully it'll be straightened out when iOS 5 is released.