After switching from v2.5.9 to 2.5.10 my code for generating an excel file with a drawing added is not working any more as expected. The file created makes excel issuing a warning about a "corrupted file". Excel offers to repair the file and successfully opens it after repair but the png image imported is not visible. Looking into the xlsx files with a zip tool I found the png image is correctly placed in the excel file but in difference to 2.5.9 the file "./xl/drawings/drawing1.xml" is not filled correctly as with 2.5.9. Please see the attached files generated with 2.5.9 and 2.5.10 version.
I just verified the odd behaviour with 2.5.11 too.
The following code snippet shows how I am adding the image.
img = Image(logofile) self.wb.active.add_image(img,addr)