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I have the Mac Express version of COW, build 64.

I just noticed that the action list on candidate moves has stopped working. I was trying to move a candidate higher up in the candidate list but when I click on the action button, the action popup shows briefly and then disappears.

The only thing I can attribute this change in behavior to is that I upgraded to macOS High Sierra 10.13.1 (17B48).

Anyone experiencing the same problem?

I've not tried MacOS 10.13.1 and I suppose it's conceivable that the new OS is causing the problem.

This problem still exists. When (if ever) is it going to be fixed.

This is fixed in build 88 for Chess Openings Wizard Express and build 87 of COW Pro.