Actually, these are 2 separate issues. I had a look again at your diagnostics and found two dump files of the audio engine. Because you have the latest HALion Sonic installed, the audio engine is dead waiting for an answer from the MediaBayServer. So it is not crashing, but the effect is similar and explains what you are experiencing. For a temporary workaround please have a look at this thread.
Second issue is: From the log files it appears that you did not install the HALion Symphonic Orchestra sound library. At least it does not get detected by the audio engine at start up. What if you create a new project from piano template, does that sound?