Hello Frederik,
I tried to copy a bunch of glyphs from a ufo generated with vfb2ufo to an empty ufo and I received the following output in the console:
Traceback (most recent call last):
File "lib/UI/fontOverView/doodleGlyphCollectionView.pyc", line 511, in copy_
File "lib/UI/fontOverView/doodleGlyphCollectionView.pyc", line 140, in _copy
File "json/__init__.pyc", line 243, in dumps
File "json/encoder.pyc", line 207, in encode
File "json/encoder.pyc", line 270, in iterencode
File "json/encoder.pyc", line 184, in default
TypeError: Data('') is not JSON serializable
Traceback (most recent call last):
File "lib/doodleDelegate.pyc", line 157, in sendEvent_
File "lib/UI/fontOverView/doodleGlyphCollectionView.pyc", line 511, in copy_
File "lib/UI/fontOverView/doodleGlyphCollectionView.pyc", line 140, in _copy
File "json/__init__.pyc", line 243, in dumps
File "json/encoder.pyc", line 207, in encode
File "json/encoder.pyc", line 270, in iterencode
File "json/encoder.pyc", line 184, in default
TypeError: Data('') is not JSON serializable
Any idea?