Crashes in iOS simulator

Hello,

Still new to Xamarin, now running into iOS simulator crashes that I cannot explain and, worse yet, have no clue as to where or how they are originating.
The messages in the system.log:

Aug  5 14:40:40 MBP assertiond[324]: assertion failed: 14E46 12H141: assertiond + 14647 [4BD82B19-3C80-388F-9EAE-F0747005D47A]: 0x1
        Aug  5 14:40:41 MBP.fritz.box splashboardd[5011]: *** Assertion failure in -[UINib initWithNibName:directory:bundle:], /SourceCache/UIKit_Sim/UIKit-3347.44.2/UINib.m:98
        Aug  5 14:40:41 MBP.fritz.box splashboardd[5011]: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: (name != nil) && ([name length] > 0)'
            *** First throw call stack:
            (
                0   CoreFoundation                      0x021d4746 __exceptionPreprocess + 182
                1   libobjc.A.dylib                     0x01e2fa97 objc_exception_throw + 44
                2   CoreFoundation                      0x021d45da +[NSException raise:format:arguments:] + 138
                3   Foundation                          0x019f4720 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 118
                4   UIKit                               0x00a8dad2 -[UINib initWithNibName:directory:bundle:] + 174
                5   UIKit                               0x00a8dc00 +[UINib nibWithNibName:bundle:] + 79
                6   splashboardd                        0x00057792 splashboardd + 6034
                7   libdispatch.dylib                   0x02a0aecf _dispatch_client_callout + 14
                8   libdispatch.dylib                   0x029f5e96 _dispatch_barrier_sync_f_slow_invoke + 54
                9   libdispatch.dylib                   0x02a0aecf _dispatch_client_callout + 14
                10  libdispatch.dylib                   0x029f3ee3 _dispatch_main_queue_callback_4CF + 677
                11  CoreFoundation                      0x0212d8ee __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 14
                12  CoreFoundation                      0x020eb5f0 __CFRunLoopRun + 2256
                13  CoreFoundation                      0x020eaa5b CFRunLoopRunSpecific + 443
                14  CoreFoundation                      0x020ea88b CFRunLoopRunInMode + 123
                15  Foundation                          0x019892d8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 309
                16  Foundation                          0x01a2780b -[NSRunLoop(NSRunLoop) run] + 82
                17  splashboardd                        0x00057e17 splashboardd + 7703
                18  libdyld.dylib                       0x02a30ac9 start + 1
                19  ???                                 0x00000001 0x0 + 1
            )
        Aug  5 14:40:41 MBP.fritz.box SpringBoard[320]: BSXPCMessage received error for message: Connection interrupted
        Aug  5 14:40:41 MBP com.apple.CoreSimulator.SimDevice.598B4C18-1DCF-4852-A2EE-0B42FB148813.launchd_sim[302] (com.apple.splashboard.06B245C1-C074-49A4-8953-F48728F48B61[5011]): Service exited due to signal: Abort trap: 6
        Aug  5 14:40:43 MBP.fritz.box MyApp_AppiOS[5010]: WARNING: The runtime version supported by this application is unavailable.
        Aug  5 14:40:43 MBP.fritz.box MyApp_AppiOS[5010]: Using default runtime: v4.0.30319
        Aug  5 14:40:47 MBP MyApp_AppiOS[5010]: assertion failed: 14E46 12H141: libxpc.dylib + 69007 [55209BF0-C183-332C-B272-05E5362CC077]: 0x7d
        Aug  5 14:40:48 MBP assertiond[324]: assertion failed: 14E46 12H141: assertiond + 14647 [4BD82B19-3C80-388F-9EAE-F0747005D47A]: 0x1
        Aug  5 14:40:48 MBP.fritz.box SpringBoard[320]: [MPUSystemMediaControls] Updating supported commands for now playing application

I use Xamarin on OSX 10.10, the Project is a Xamarin.Forms project with subprojects for Android and iOS.
This might be related with an earlier question I posted here about the connection between Xamarin Studio and the iOS simulator not being stable/reliiable.