Several notes about this Sound Issue:
I have investigated this one and here is what I found out:
Pencil2D will crash right away everytime a .mp3 Sound file is imported.
It will Not crash immediately when a .wav Sound file is imported and nothing will be showed on the Sound Layer after that. For it to crash select File > NEW. The New document will not be opened and Pencil2D will close (crash)
(Using Win8.1 x 64bits)
A curious note about the .mp3 sound file: after the crash the .mp3 file will be deleted for good (I was not able to find it anyway). It doesn’t happen with the .wav file
I noticed when Importing a SOUND, the Sound Layer must be selected in the first place or else a windows message will popup saying “No sound layers exists as a destination for your import. Create a new sound layer”, despite there is a sound layer already presented.
I just wanted to point this out but I think this is a normal behaviour, doesn’t it?