Audio stopped working with Leia upgrade

I've been using Kodi Krypton with no issues, but when I upgraded to Leia (manual upgrade from Libreelec) my audio stopped working for GUI sounds as well as the Chromium browser. I've tried every combination of audio settings I can think of within Kodi, but no success. Hardware is an ASUS Chromebox CN60 Model M075U, Intel Core i3 4010U / 1.7 GHz, 4GB 1600 MHz DDR3 SDRAM, 16 GB M.2 SSD, two 1TB 2.5 inch mechanical HD attached to USB ports, standalone installation of Libreelec. The Libreelec Chromebox is is connected to an LG TV via HDMI and the TV's digital audio out is connected to a Yamaha HTR-5640. The TV supports passthrough of Dolby Digital and DTS surround, and that setup still works flawlessly. Skin is Rapier. I've checked the forums, but haven't found anything similar. The link to my log file is: https://drive.google.com/file/d/1wyahvyytvpgb-3jonungzpvajvl_qzcm/view?usp=sharing

So it turns out I didn't realize the Kodi interface had gotten muted, so that's fixed, but there's still an issue with Chromium.