Hi Jason,
I am using docx4j vesion 8.2.0 to remove metadata (creator, LastModifiedBy). (I am using the class SpreadsheetMLPackage to load file and the class SaveToZipFile to save the new file)
I have a file with a watermark that get corrupt after removed metadata.
I tried with the latest version 8.2.3 also the file get corrupted.
The new thing in those files are the watermark, so wonder if this versions support the watermark for exel ...