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Upgraded to Windows 10 a couple of weeks and just noticed that almost all of the icons on my desktop have a small red X in the lower-left corner. The recycle bin and some documents seem to be the exceptions.
Don't know if this occurred right after the upgrade or more recently.
Any ideas on what this is supposed to indicate?
I'm not allowed to answer due to insufficient reputation, but in my case this problem was not caused by the icon cache, but by an automatic update to OneDrive. The problem is solved by turning off Files On-Demand as described here
– personal_cloud – 2019-07-28T18:56:26.583