Excel 2013 displays an curved arrow instead of a rectangular shape as comment box in excel file created from xssf class library (2.0.1 beta). The picture from generated test.xlsx example is in attachment.
Excel 2010 displays same file correctly.
Comments: ** Comment from web user: PETER_DA **
Excel 2010 displays same file correctly.
Comments: ** Comment from web user: PETER_DA **
This is caused by the same VML issue that breaks XLSX files with images in headers (issue 12831):
When replacing the VML Drawing file with a "good" one, the comment shape is fine.
The XSSFVMLDrawing seems to introduce some issues parsing and re-writing the XML nodes.