Thanks a lot Noash0504 I appreciate your help! Unfortunately running it with --disable-gpu gives me the same result as before, minus ATTENTION: default value of option force_s3tc_enable overridden by environment.
Here are some more system details if that helps.
Operating System: Debian GNU/Linux 9 (stretch)
Kernel: Linux 4.9.0-8-amd64
Architecture: x86-64
Edit: Also tried adding the --disable-seccomp-filter-sandbox flag as suggested by @motoaxe here Plexamp Linux crash on launch and same outcome.
