Actually seems to happen when I walk away and reaper is idle, strange!
OSX 10.15.7
Reaper 6.19
Not using any scaler sounds. Number of scaler tracks about 10.
Small trace:
Thread 58 Crashed:: ESSENTIA_THREAD
0 libsystem_pthread.dylib 0x00007fff6ed6d5ad pthread_mutex_lock + 0
1 libsystem_pthread.dylib 0x00007fff6ed72500 _pthread_exit + 52
2 libsystem_pthread.dylib 0x00007fff6ed6fe08 pthread_exit + 42
3 libsystem_pthread.dylib 0x00007fff6ed72166 _pthread_testcancel + 68
4 libsystem_pthread.dylib 0x00007fff6ed72433 _pthread_cond_wait + 712
5 com.pluginboutique.Scaler2 0x000000011836ebbb essentia::streaming::RingBufferInput::process() + 75
6 com.pluginboutique.Scaler2 0x0000000118342499 essentia::scheduler::Network::runStep() + 1145
7 com.pluginboutique.Scaler2 0x0000000118908488 scaler::EssentiaAnalyser::process() + 104
8 com.pluginboutique.Scaler2 0x00000001189078c8 scaler::AudioAnalyser::run() + 232
9 com.pluginboutique.Scaler2 0x000000011877fdb9 juce::threadEntryProc(void*) + 537
10 libsystem_pthread.dylib 0x00007fff6ed72109 _pthread_start + 148
11 libsystem_pthread.dylib 0x00007fff6ed6db8b thread_start + 15