Batch render doesn't work for me in Maya 2020 (It's fine in 2019). It quite quickly tells me that the render is completed when it isn't. This happens with Arnold, Viewport 2.0 and Redshift.
Maybe it is to do with this error message?
# Error: line 1: RuntimeError: file C:\Program Files\Autodesk\Arnold\maya2020\scripts\mtoa\cmds\registerArnoldRenderer.py line 125: Error occurred during execution of MEL script
file: C:/Program Files/Autodesk/Maya2020/scripts/others/createMayaSoftwareCommonGlobalsTab.mel line 1162: Object ‘imageMenuMayaSW’ not found.
I should mention that I have tried trashing prefs and re-installing Maya.