Congrats on Beta 2 guys! Looking really good.
Small bug here with Advanced Output file loading:
1. In Arena 6 Beta 2, have a composition going and save an Advanced Output preset with some random adjustments
2. Save comp and close Arena
3. Launch Arena, last comp is loaded as expected
4. Open Advanced Output, last preset is loaded as expected but not in the dropdown list of presets
So the issue is that after each launch of Arena, a user essentially needs to manually re-select the correct preset from the dropdown even though the preset is loaded. If you open AO and just start making changes, you'll need to save that as a new preset. Otherwise when you select the preset from the dropdown, it will overwrite any changes you just made.
Hope that makes sense.