There are 3 main problems in version iOS 2.9 for Unity Support 1. Definitions missing!!! some definitions were missing in "OpenFeintDefine.h" and other files, failed to compile. (such as "OF...PromptUser....." I can remember now, but I knew it was a define from Initialization of Unity setting.) This issue is not only appeared in this version, but also older version of OF, like OF iOS 2.8 and earlier version seems not fixed for long long long time.... 2. Wrong Frameworks reference!!! some frameworks are missing. (added on wrong version of Frameworks? SDK 4.2 can not find them but have to delete old ones and re-add them.) 3. Crashed!!! After I added the missing definition to .h .mm files, it seems work and some complier warnings remains only. but it crashed with a "SIGABRT" after Unity Pro 3.3 splash image, even not see anyone OF launchboard. I wonder have they really test it on a real device before releasing the new version?