IG is acting up for me too but mine tries to launch and then closes back up, tried rebooting the phone with no luck, finally removed and reinstalled the app and was able to get in once but when I tried to open it again a few minutes later it reverted back to the original problem, I chalked it to me running PB2 on my 6+ but a few minutes later my wife, who's running Os9 told me she had the same exact issue....checked for any recent updates in the app store but saw none so not really sure what's up.