AAE -9173 after leaving session open

[LukeHoward]

Left session (with very few native plugins) open overnight, came back, cannot play without getting AAE -9173. CPU meter is pinned at 100%. Closing and re-opening session did not help; restarting Pro Tools did. Any ideas?

System: HDX1, Pro Tools 2019.10.0, MacPro5,1 running macOS 10.14.6.

Log file gives a clue, appears to have been spinning in the following:

252440.909485,3c803,0e10: FicOSErr: DAE Error being generated: -9004
Stacktrace:
        0x126d63359 : - (AAE @ 0x126cb8000)
        0x126d29b76 : - (AAE @ 0x126cb8000)
        0x126dea83b : - (AAE @ 0x126cb8000)
        0x126d9c9f6 : - (AAE @ 0x126cb8000)
        0x126d9c71c : - (AAE @ 0x126cb8000)
        0x110724623 : - (DSI @ 0x11065d000)
        0x110664017 : - (DSI @ 0x11065d000)
        0x110403b7e : - (DigiPlatformSupport @ 0x1103fb000)
        0x1104043a2 : - (DigiPlatformSupport @ 0x1103fb000)
        0x110405915 : - (DigiPlatformSupport @ 0x1103fb000)
        0x7fff723822eb : - (libsystem_pthread.dylib @ 0x7fff7237f000)
        0x7fff72385249 : - (libsystem_pthread.dylib @ 0x7fff7237f000)
        0x7fff7238140d : - (libsystem_pthread.dylib @ 0x7fff7237f000)
252440.909678,3c803,0e0f: CMN_TRACEASSERT err == 0 /Volumes/Development/238958/ProTools/AAE/Source/HostTDMDeck/CHostXDevice.cpp line 1808
252440.963711,3c803,0000: Sleeping for 30 ms after 9173