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Thanks for sharing your SeaDAS info. It says you are running on MacOS 10.16, which I doubt. Could you please find out your Mac version by "About This Mac" on the Apple menu?

I am able to run l2gen successfully on the above mentioned file with OCSSW V2022.3 on MacOS 12.6.

We replicated the error and are looking into the issue. Thanks for reporting the bug.

You probably are not using the latest tag of SeaDAS science processing package (OCSSW). The latest tag is V2022.3.

Can you do SeaDAS-Toolbox -> Software & System Info and post the result here if you are using SeaDAS 8.3.0?

If you are talking about the Range for Color Manipulation, you can change the Max value as you need.

l2gen on S2B_MSIL1C_20220423T135109_N0400_R024_T20HPB_20220423T172721.SAFE went through with no error, but I did get blank Rrs.

l2gen on S2B_MSIL1C_20180314T154009_N0206_R011_T18SVF_20180314T205107.SAFE went through with valid Rrs values.

It turns out I am able to do l2gen on the MSI_S2A file you provided and created an L2 file with valid Rrs data

Yes, it's a known bug. For resolution=250, 500, the work around is to do l1aextrract_modis first and the do l2gen without subset.

Here is a post that might be helpful -- viewtopic.php?p=11063&hilit=l2gen#p11029

You don't need to alter anything if you want to do l2gen on GUI with default values. However, if you want to do l2gen with "Multi-scattering with MUMM correction and MUMM NIR calculation", you need to choose "-10: Multi-scattering with MUMM correction and MUMM NIR calculation" fo...

Please share what version of SeaDAS and what tag of SeaDAS Science Processing Package (OCSSW) you are using. Please also share the name of your L1A file, so we can try to replicate the error.

Thanks George for pointing out the difference between the average of geophysical parameters and the math average. Hope I get it right this time -- ((chlor_a_M >= 0.0 ? chlor_a_M : 0) +( chlor_a_D0 >= 0.0 ? chlor_a_D0 : 0) + (chlor_a_D1 >= 0.0 ? chlor_a_D1 : 0)) / (((chlor_a_M >= 0.0 ? 1 : 0) + (chlo...