Comment to Protean Timeline Columns
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You can use Timeline Outline representation, it has the same content but in 3 columns, this block most probably reactivated by dafault, so you need something like this:
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If Outline block is set to full width block, then it should have 3 columns, please check error log in your browser it maybe there is some JS error on your page.
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Disabling cache for pages and html files as well as disabling lessening for js files resolved this problem. Now the posts are displayed in 3 columns.
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