Audio Sync

[BLAlley]

I've been using Avidemux for a while now, starting in Windows and continuing after switching to Linux (Unbuntu 24.04 based Zorin OS). It always worked well, until this week it decided to not play audio in sync with the video on any file I drop into it.
I verified the integrity of the files by playing them in VLC, Shot Cut, Totem, and Plex Media Server clients and the web interface. All play them perfectly.

I'd appreciate any insights into why it's suddenly not working since it's become unusable. It's version 2.8.1. Thanks.