If you get this annoying message from your favorite MS application, you may have read the internet to the end until you got here. We had the same issue with Word or Excel and tried to get into that problem. First of all, we recognized that it only appears when we upgrade our clients from Windows 7 to Windows 10 1809. If we made a different step between, that everything worked as expected. You may read a lot of stories where Microsoft has a bug on 1809 and you should upgrade to the next Windows 10 version (1903) to „fix“ this problem, but in some cases you can’t and have to deal with this problem like we did. What’s the problem? As you can read in the internet, you may have already mentioned that this issue is a issue with fonts. Some problems occur, when you add fonts to the fonts directory and add an entry to the registry, like everyone does, when you have to deal with additional fonts like barcode fonts e.g. Even it is not recommended, it worked for a long time What did you do while analyzing the root cause? We tried several tools like „fontreg“…