It's a bug in Hybrid (which was fixed in the last release, you are using an older one).
the call using is:
Problem ist the definition of the DAR "-aspect 1.36574e+09:1000000000" this is wrong, happens here:
using "-aspect 1.36574" should work. 
-> try latest public release (old jobs need to be recreated) at least here it properly uses "-aspect 1.36574".
(If you replace this in the above call, you could also call the call inside a terminal window and it should create the file.)
Cu Selur
Ps.: have to go to bed now.
the call using is:
"/Applications/Hybrid.app/Contents/MacOS/ffmpeg" -y -r 25/1 -i "/private/var/folders/8p/1hb1pnd90jndy5krc74xjdgc0000gn/T/Sample MVL Movie - Hybrid Output_2022-01-14@21_13_02_3410_07.mov" -i "/private/var/folders/8p/1hb1pnd90jndy5krc74xjdgc0000gn/T/iId_6_aid_0_lang_en_2022-01-14@21_13_02_3410_05.aac" -vcodec copy -acodec copy -metadata encoding_tool="Hybrid 2021.07.18.1" -map 0:0 -map 1:0 -aspect 1.36574e+09:1000000000 -r 25/1 -f mov "/Users/Study/Movies/Sample MVL Movie - Hybrid Output.mov"'2022.01.14 - 21:13:02_macOS 10.15 (64bit)_2021.07.18.1 - level 9: parToDar,...
2022.01.14 - 21:13:02_macOS 10.15 (64bit)_2021.07.18.1 - level 9: width: 720
2022.01.14 - 21:13:02_macOS 10.15 (64bit)_2021.07.18.1 - level 9: height: 576
2022.01.14 - 21:13:02_macOS 10.15 (64bit)_2021.07.18.1 - level 9: par string: 59:54
2022.01.14 - 21:13:02_macOS 10.15 (64bit)_2021.07.18.1 - level 9: par double: 1.36574074
2022.01.14 - 21:13:02_macOS 10.15 (64bit)_2021.07.18.1 - level 9: -> DAR: 1.36574e+09:1000000000-> try latest public release (old jobs need to be recreated) at least here it properly uses "-aspect 1.36574".
(If you replace this in the above call, you could also call the call inside a terminal window and it should create the file.)
Cu Selur
Ps.: have to go to bed now.
----
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.