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Hi, ricnergy
Thanks for reaching out to Microsoft Q&A forum.
Sorry for this frustrating experience that you're having. What you’re seeing usually isn’t “corrupt Clipboard” as much as Excel getting stuck when the copy/format action triggers something else in the background, most often an add-in, a Windows clipboard feature, or a rendering/performance glitch that turns a simple Copy or Format Painter click into a hang.
Here are some suggestions you can try:
Test and remove the most common culprit: add-ins (especially COM add-ins)
Close Excel, press Win+R, type excel /safe, then try Copy or Format Painter. Safe Mode runs Excel without most add-ins, so if the freeze stops, you’ve proven it’s an add-in conflict rather than “your Office install.” Next, disable add-ins one by one in normal mode: File > Options > Add-ins and manage COM Add-ins and Excel Add-ins until the issue disappears. This works because many PDF, antivirus, BI, or clipboard-related add-ins hook into copy/paste events.
If you’re on Windows 11: turn off “Clipboard Suggested Actions”
Go to Settings > System > Clipboard, find Suggested actions, set it Off, then restart Excel. Windows can try to interpret what you copied (dates, numbers, tables) and that extra analysis can overload the copy operation, especially with large selections.
Disable Live Preview in Excel
In Excel: File > Options > General > uncheck Enable Live Preview, restart Excel. Live Preview constantly renders formatting previews, and when Format Painter is involved, that can amplify lag into a hang on some systems or workbooks.
Clear Office’s web add-in cache (quick, safe cleanup)
Press Win+R and open: %LOCALAPPDATA%\Microsoft\Office\16.0\Wef\ then delete the files inside, restart Excel. This can help if clipboard-related UI components or add-in artifacts are stuck in a bad state.
Update Office (and Windows) even if you already repaired
Repair fixes files, but it won’t always remove a bug that was fixed in a later build. Go to File > Account > Update Options > Update Now, then reboot.
Hope this helps. Feel free to get back if you need further assistance.
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