Never ending Check Book on one computer

Desktop computer ; Windows 10, Calibre 8.4 64

From my main computer, desktop, suddenly, once again the Check book function never ended ( after several hours I stopped the process from Tasks Manager)

I first thought it was a problem with the book, but it happened on other books too.

So I opened same book from Calibre Editor on my laptop which still runs Calibre 8.3 ( Windows 10), and ran the Check book function.
After several seconds the result was there displaying errors.

On Desktop, I ran install Calibre 8.4 with Repair option, but the Check book behavior still the same after it

Please, may anyone tell me how to fix my Calibre 8.4 behaviour ?

( I would like to avoid uninstalling fully Calibre and reinstall after, because I have many search-replace regular expression recorded and I don't know how to export them globally. )

Thanks a lot and please forgive my poor english.