1In src/ft2font.cpp, to improve debugging, the error value returned from 2FT_Glyph_To_Bitmap() was added to the error message. 3 4It is documented that using the MacOSX backend, running an animation with blit 5turned on will go into an infinite loop. So in lib/matplotlib/animation.py, 6an exception is thrown, suggesting to either switch backends, or turn off 7blitting. 8