Simple app crashes on iOS6.1.3 R285.1 XCode 7.1

Having some weird problems with crashes straight after the splash screen, but only on earlier devices (iPad 2 and iPod touch 4G both running iOS 6.1.3), fine on iPod touch 5G and iPad Air running iOS 8.0.2 and 8.1 respectively - using R285.1 and XCode 7.1

I've attached an MFA file which just has a single frame with just a string object that says "Test App"

Any idea how to fix? Any help is much appreciated!

Seems fine on R284.10 - may have to revert back to that version
I have noticed that the Xcode zip now contains Ogg.framework and Vorbis.framework, which aren't there in R285.10 - and I'm not using any Music or SFX

Here's the XCode log:
AudioStreamBasicDescription: 2 ch, 44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved
2016-03-08 14:48:15.833 TestAppCrash_iOS6-1-3[400:907] -[__NSCFConstantString sizeWithAttributes:]: unrecognized selector sent to instance 0x2df9d4
2016-03-08 14:48:15.844 TestAppCrash_iOS6-1-3[400:907] CRASH: -[__NSCFConstantString sizeWithAttributes:]: unrecognized selector sent to instance 0x2df9d4
2016-03-08 14:48:15.904 TestAppCrash_iOS6-1-3[400:907] Stack Trace: (
0 CoreFoundation 0x323a22bb <redacted> + 186
1 libobjc.A.dylib 0x3a02097f objc_exception_throw + 30
2 CoreFoundation 0x323a5e07 <redacted> + 170
3 CoreFoundation 0x323a4531 <redacted> + 392
4 CoreFoundation 0x323a5938 <redacted> + 24
5 TestAppCrash_iOS6-1-3 0x0022846d -[NSString(NSStringExtension) sizeWithFont:] + 224
6 TestAppCrash_iOS6-1-3 0x00224f51 +[CServices drawText:withString:andFlags:andRect:andColor:andF ont:andEffect:andEffectParam:] + 1156
7 TestAppCrash_iOS6-1-3 0x001fa195 -[CTextSurface setText:withFlags:andColor:andFont:] + 556
8 TestAppCrash_iOS6-1-3 0x001f3c0d -[CText draw:] + 816
9 TestAppCrash_iOS6-1-3 0x001f41e9 -[CText spriteDraw:withSprite:andImageBank:andX:andY:] + 68
10 TestAppCrash_iOS6-1-3 0x002401ef -[CSpriteGen winDrawSprites:] + 434
11 TestAppCrash_iOS6-1-3 0x00240395 -[CSpriteGen spriteDraw:] + 44
12 TestAppCrash_iOS6-1-3 0x0020431d -[CRun screen_Update] + 1096
13 TestAppCrash_iOS6-1-3 0x0020cb8d -[CRun f_GameLoop] + 3332
14 TestAppCrash_iOS6-1-3 0x001fda15 -[CRun doRunLoop] + 88
15 TestAppCrash_iOS6-1-3 0x00090051 -[CRunApp loopFrame] + 100
16 TestAppCrash_iOS6-1-3 0x0008e751 -[CRunApp playApplication:] + 892
17 TestAppCrash_iOS6-1-3 0x0009e8cd -[CRunView timerEntry] + 1996
18 Foundation 0x32cb9f53 <redacted> + 62
19 CoreFoundation 0x323775df <redacted> + 14
20 CoreFoundation 0x32377291 <redacted> + 272
21 CoreFoundation 0x32375f01 <redacted> + 1232
22 CoreFoundation 0x322e8ebd CFRunLoopRunSpecific + 356
23 CoreFoundation 0x322e8d49 CFRunLoopRunInMode + 104
24 GraphicsServices 0x35e9b2eb GSEventRunModal + 74
25 UIKit 0x341fe301 UIApplicationMain + 1120
26 TestAppCrash_iOS6-1-3 0x000827c3 main + 118
27 libdyld.dylib 0x3a457b20 <redacted> + 0
)
2016-03-08 14:48:15.914 TestAppCrash_iOS6-1-3[400:907] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFConstantString sizeWithAttributes:]: unrecognized selector sent to instance 0x2df9d4'
*** First throw call stack:
(0x323a22a3 0x3a02097f 0x323a5e07 0x323a4531 0x323a5938 0x22846d 0x224f51 0x1fa195 0x1f3c0d 0x1f41e9 0x2401ef 0x240395 0x20431d 0x20cb8d 0x1fda15 0x90051 0x8e751 0x9e8cd 0x32cb9f53 0x323775df 0x32377291 0x32375f01 0x322e8ebd 0x322e8d49 0x35e9b2eb 0x341fe301 0x827c3 0x3a457b20)
libc++abi.dylib: terminate called throwing an exception

Since no response, I've posted it in the BugBox here: http://bugbox.clickteam.com/projects/ios-exporter/issues/new?issue%5Btracker_id%5D=1

I believe the Min. requirement is IOS 7 now.

I am checking this, but not easy to reproduce here though.

I was getting a similar crash that only appeared on an ios6 ipad2. It appeared to be related to making a text box visible in my app. The same problem did not occur on devices with ios7 or later so I think Perry's comment is on the right track.

Thanks for the replies!
Pretty sure I've managed to run an iOS app made with Fusion 285.1 on iOS 6.1.3
Is there something official from ClickTeam that specifies min iOS version for versions of Fusion 2.5 (eg 285.1 or 284.10)
It would be good to know before updating, as it might limit the few devices I have to test on...

When you updated Fusion to one of the latest version, the IOS exporter will give you a 1 time warning that the min version had to be IOS 7

Perry - I don't remember such a warning - is this when installing/updating Fusion or when Exporting to iOS?

Updating to 285.0 or the latest beta. once you loaded an IOS project, you were getting that warning.

AyreGuitar and Fernando: I can provide my project file for testing if you need it. But I can only get it to reproduce on a device with ios6. Simulator does not reproduce the crash.

Perry: I don't remember this warning, but I have gotten all apps to run on an iOS6 device with the latest xcode and Fusion beta. I only have a crash with that one special case of using a string object.