Thank you for the response.
The OS is Windows 10.
In addition to the symptom that was described aforehand, Athena freezes when I try to save the file.
Is it possible that the folder or file you are saving to has a space or other non-ASCII character in it? I believe that non-ASCII characters are known to cause problems.
Can you check whether you can save a file anywhere (maybe even the top-level "C:\" folder)?