Windows 10 suddenly display "x" icon on all drives

This happened yesterday (2019-07-11). I do not remember doing anything before this happened at my office PC, I do everything in my mind to solve this, including deleting icon cache, but none works.

Your Dropbox client was automatically updated to 77.3.125 which is known to cause this problem.

So from what I can see initially, @Disk4mat and @AKai-945 you’re both running a beta version of the desktop app, denoted by xxx.3.xxx. Would you mind downgrading to the latest stable version and let me know if you still see the same issue?

Source: Bug: Fixed & Removable Drive Icons Have Red X Overlay

You should rollback to 76.4.126 in order to solve your problem. I can confirm that the DropBox 76.4.126 client does NOT have this particular problem. In order to avoid this problem in the future, you should perform the following actions, to prevent Early releases from being installed automatically.

You can do this by going to your account settings page here, and towards the bottom of the web page you need to toggle off the option for “Early releases”.

Deleting the corrupted cached icons.db from C:/Users/(CurrentUser)/AppData/Local/ does solve my problem. Hope it solve others problem too.