yosemite finder column view stuck in single column all files view

I am using Yosemite on a MacBook Air, and am a veteran Mac user since 1989. Today I can not switch out of Single column All Files view even though the menu or icon suggests I should be seeing multi-column view. Is there a known bug, or a way to reset this? Thank you.

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I found a work-around to this bug. I clicked on a file in Finder. On the bottom of the Finder window is a "bread-crumb" directory folder/file path; on a folder I right-clicked (option-click) and from the pop-up menu chose (paraphrasing here) Show File in Enclosed Folder. Voila -- Column view popped back as it should appear.

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