What is at issue here is an apparent bug in the 'news and interests' widget that Microsoft has begun pushing out to Windows 10 PCs. By default, this shows the weather in your particular region, and if you hover the mouse cursor over the widget (or click or tap it), it brings up news headlines, stock quotes, sports scores, traffic information, and other stuff (which you can personalize). That is all fine and dandy, but it is blurry compared to the rest of the taskbar.
Earlier this month, Microsoft published June 2021 security patch for Windows 10 version 21H1, version 20H2, and version 2004. KB5003637 is a security and mandatory update intended to patch the security bugs reported in the operating system and issues caused by the previous update, including the long-running memory leak bug. Based on the various posts we've seen across our own forum and social media sites, Windows 10's taskbar bug appears to be a growing issue, particularly affecting devices where the "News and Interests" feed has been turned off using Group Policy or taskbar context menu..
Comments on the blurry taskbar icon problem are also available on the Feedback Hub, with various users explaining how their taskbar stopped working properly after they deployed the mandatory security update.
In an update to the support document, Microsoft has finally acknowledged the reports, with the company stating that the blurry taskbar bug affects "certain display configurations" only. No specifics were provided and it's unclear how many users are affected worldwide.
"After installing KB5001391 or later updates, the news and interests button in the Windows taskbar might have blurry text on certain display configurations," the company stated in the updated documentation, and promised that the fix will be provided in an "upcoming release".
Contrary to what Microsoft says, I've observed the blurry text bug across the taskbar/system tray icons and it's not limited to the weather icon (News and Interests button).
To fix blurry icons or texts bug on your taskbar after applying June 2021 update Right-click on the taskbar, select News and interests and click Turn off. If it's already disabled and you still have the issue, enable it to see if that fixes your problem. You can also use the "show icon only" mode of News and Interests.