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On OS X 10.8 I'm using Chrome 23.0.1271.64, the latest version as of today. The "Most visited" page thumbnails show content which completely outdated since months, though I visited the pages in the mean-time. How to refresh the previews/thumbnails?

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If you delete every thumbnail by hovering over it and clicking "x" on upper right of each one, it will say "thumbnail removed" Then it offer option to undo. Click "restore all" Does it work? – sajawikio Nov 16 '12 at 19:41
Already tried without reliable success. Sometimes it works, most often not. – Mike L. Nov 17 '12 at 9:52
for more reliable way does this work instead?… – sajawikio Nov 17 '12 at 22:39
No, because there is no Thumbnails file. – Mike L. Nov 18 '12 at 6:42
Well, after deleting the Top Sites, the complete "most visited" pages will be reset. – Mike L. Nov 24 '12 at 12:10

I had the same problem in the Windows version. I figured out that the problem was that I was clicking all the tiles with the jog wheel to open them in eight new tabs. That's very convenient, except Chrome only updates the site thumbnail when you left-click to open the shortcut in the current tab.

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Try to delete existing "Most visited" pages preview and they should be replaced with new ones which appear to be frequently used.

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OP wanted to know how to update a thumbnail. Clearing them is not the same thing. – Ron Feb 21 '13 at 18:06
Then why after deleting old thumbnails I get them replaced with new, which previously were not on the thumbnail page? – Volodymyr M. Feb 21 '13 at 18:50

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