Rewire is crashing you it looks like
Thread 7 Crashed:
0 libsystem_pthread.dylib 0x00007fffe15c06f7 pthread_mutex_unlock + 0
1 se.propellerheads.rewire.library 0x000000010596174c RWIsReWireMixerAppRunningImp + 85516
2 se.propellerheads.rewire.library 0x0000000105961688 RWIsReWireMixerAppRunningImp + 85320
3 se.propellerheads.rewire.library 0x00000001059444e3 0x10592e000 + 91363
4 se.propellerheads.rewire.library 0x000000010595273e RWIsReWireMixerAppRunningImp + 24062
5 se.propellerheads.rewire.library 0x000000010594c356 RWM2DriveAudioImp + 86
6 com.cockos.reaper 0x0000000100328b9c RWMDriveAudio + 12
7 com.cockos.reaper 0x000000010070f6dc ReWire_BRIDGE::RWMDriveAudio(void*, ReWire::ReWireDriveAudioInputParams const*, ReWire::ReWireDriveAudioOutputParams*) + 892
8 com.cockos.reaper 0x00000001003359b0 Rewire_Plugin::RewireProcessSamples(double*, int, int, int, int, double, MIDI_eventlist*, bool) + 1408
9 com.cockos.reaper 0x00000001003ad826 FxDsp:
rocessSamples(int, double*, int, int, int, double*, midi_List*, double, bool, double) + 4854
10 com.cockos.reaper 0x00000001003c9774 FxChain::ProcessSamples(int, double*, int, int, int, int, double, midi_List*, double, bool) + 452
11 com.cockos.reaper 0x00000001000ebd1a MediaTrack::RenderSamples_nocache(double, long long, double*, int, int, double, MediaTrack**, int, int*, bool, int, int, bool*) + 13914
12 com.cockos.reaper 0x00000001000f3495 MediaTrack::RenderSamples(double, long long, int, Track_RS_Output*, int, double, MediaTrack**, int, midi_List*, int, int, int, int, int, MediaTrack::Track_SendRec*, bool*) + 2725
13 com.cockos.reaper 0x00000001000f8a23 MediaTrack::RunWorkThread(int, double, MediaTrack**, int) + 1955
14 com.cockos.reaper 0x0000000100143324 WorkerThreadInst::threadProc(void*) + 1092
15 com.cockos.reaper 0x000000010050ea65 __threadproc(void*) + 37
16 libsystem_pthread.dylib 0x00007fffe15c293b _pthread_body + 180
17 libsystem_pthread.dylib 0x00007fffe15c2887 _pthread_start + 286
18 libsystem_pthread.dylib 0x00007fffe15c208d thread_start + 13
You can trash Reapers Preference file to see if that will fix things for you
HD/User/Library/Preferences, look for com.cockos.reaper.plist
Just trash the Reaper application under applications if you are wanting to install a fresh copy