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I have just installed the updates of the oprating system, and have not recompile NWCHEM6.8, and now the calculation gave different excitation orbitals.

I have put the log files on github, and you can refer to them.

I will recompile it and see.

They are also different on macOS High Sierra.

I have put the log files on github.

Recompilation of NWCHEM6.8 on Ubuntu makes the double contribution different.