What
There is a new error, WORKING_FILE_HELD, for when a working file cannot be put in place. Its message is "another program holds the file".
Why
If you see this message, another program on your computer has the file open or locked. Closing that program is the likely way to free the file.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
The finding does not say which feature places working files or when the error appears.