After some effort I got cgoban to work on my osx 10.10.5 when I click on it directly, but I can't get it open a sgf file. It's grayed out when I try to use open with "other". Any suggestions?

What do you mean when you try to open it with 'Other'? Do you mean that you are right-clicking on the SGF file? That won't work because KGS isn't packaged as a native .app file. Have you tried clicking on 'Edit SGF File' on the KGS splash screen and navigating to the SGF file in the pop-up?

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that's exactly the issue -- I'd like to be able to open a file with a single click. (I know it's not a big issue, but on the old version I used to be able to do it.)