Hi,
I have imported a MP3 sound file and renamed it “war3Imported\bla_x.mp3” and then pressed Ctrl+U in the sound editor and the editor crashed.
I have also tried renaming it “war3Imported\bla x.mp3”. Same effect when using it.
It worked when I removed the sound effect already used previously based on the renamed sound and then used it again. Maybe the renaming a sound effect and then using it again while it has already been used with a different name caused the crash. Not sure.