I did not find any other inkscape instance, but i am not sure about this point. At least i did some experiments with reinstallation:
1. on a more or less fresh install of Windows 10 (64 bit) (some other programs, e.g. Visual studio, office were already installed) i installed inkscape 0.91 (64 bit)
2. I tested again using the levenshtein-emf example linked above
2.1. open inkscape and open the file
=> correct
2.2. save as pdf => partly incorrect - all 4 lines with arrows are gone
3. I then installed lyx 2.2.1
4. Without ever starting lyx i repeated my experiments of 2.
=> just after opening the texts are scrambled (stacked on top of each other in the top left)
=> saving as pdf additionally destroys all lines with arrows
5. i tried to reinstall inkscape
5.1. deinstall inkscape
5.2. run the installer again
5.3. repeat experiment 2.
=> again, directly after opening the emf the texts are broken (stacked in the top left)
I did not find any other inkscape instance, but i am not sure about this point. At least i did some experiments with reinstallation:
1. on a more or less fresh install of Windows 10 (64 bit) (some other programs, e.g. Visual studio, office were already installed) i installed inkscape 0.91 (64 bit)
2. I tested again using the levenshtein-emf example linked above
2.1. open inkscape and open the file
=> correct
2.2. save as pdf => partly incorrect - all 4 lines with arrows are gone
3. I then installed lyx 2.2.1
4. Without ever starting lyx i repeated my experiments of 2.
=> just after opening the texts are scrambled (stacked on top of each other in the top left)
=> saving as pdf additionally destroys all lines with arrows
5. i tried to reinstall inkscape
5.1. deinstall inkscape
5.2. run the installer again
5.3. repeat experiment 2.
=> again, directly after opening the emf the texts are broken (stacked in the top left)