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Thanks PsyDye, but as I have said in my original post, that is what I have been doing. Not really a big issue, but an annoyance! I wonder if it is Chrome updating, however I would have thought this would revert to the Chrome image not a generic one. I got bored keep trying to find the image, so I even created a folder in 'Applications' called 'Google Custom Image' so it sits immediately next to Google Chrome so I can find the logo easily, and therefore it shouldn't forget - but it still does.
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I can replace either of these with the custom one no problem, but again, after a few days it forgets. If I go back to the 'Applications' folder 'Get Info' and click the generic image, press delete, it reverts the the Chrome icon. This then stays for a few days, but after a while the icon changes to a generic "can't-find-the-image" type one (not back to the Chrome original). I have downloaded the image, and discovered that I have to change the icon in the 'Applications' folder, this allows the change, and after a while it filters down to the Launchpad and Dock icons. I have moved Chrome to my dock and wanted to change the logo to that of the software I use. Recently, I have started using new cloud based software for work, this works best in Chrome, I only ever use Chrome for this purpose. I do know how to do this, and other icons I have changed work fine, it's just this one. I have a folder on my desktop with a custom icon, this has stayed the same for 5 years, so no problem. After a few days it reverts to a blank page with an A made of pencils and a rule in the corner. I have changed an icon image to a custom icon.
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