[eschwartz]

Not working for me either.

Also, I got a weird error, running from source.

calibre, version 2.9.0
WARNING: Errors while adding: There were problems adding some files, click "Show details" for more information


----------------------------------------------------------------------
Failed to read metadata from the file(s):
	C:/Users/eschwartz/Downloads/Thay Thong Ngon (1926) - Ho Bieu Chanh - vie.epub
With error:
Traceback (most recent call last):
  File "C:\Users\eschwartz\git\calibre\src\calibre\utils\ipc\pool.py", line 313, in worker_main
  File "C:\Users\eschwartz\git\calibre\src\calibre\ebooks\metadata\worker.py", line 58, in read_metadata
  File "C:\Users\eschwartz\git\calibre\src\calibre\ebooks\metadata\worker.py", line 38, in run_import_plugins
  File "C:\Users\eschwartz\git\calibre\src\calibre\customize\ui.py", line 158, in _run_filetype_plugins
  File "calibre_plugins.dedrm.__init__", line 77, in write
IOError: [Errno 22] Invalid argument

The book imports without any metadata.

I do not get that when reverting the source to tag v2.9.0.

Also, I noticed the windowname "libprs500" in the progressbar popup in Adding Duplicates.