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when opening an Excel file comes o.g. Error message. It can only continue to work if you confirm this with “later”. If you choose “save”, the cryptomator crashes.
Unfortunately, reinstalling did not help either. Cryptomator, as well as the PC, are at the latest patch level. Even a reinstallation of Office was unsuccessful.

Does anyone have an idea?

Many Thanks!

Seems to me like with the office upload center.
Please see here: Office Upload Center may interfere with saving to Cryptomator drives

I have a personal recommendation: dont work on office files directly in the vault. The Windows WebDav and OfficeOnline environment is not as stable as Microsoft is trying to convince us.