Problem Details: I made a new map, saved it and left for a bit. When I came back and opened it the song was gone. All the hit objects were still there, and timed properly but there was no song, yet the mp3 file was still in the map folder. I tried to copy the difficulty and use it with different mp3s of the same song and the song would always be gone when I opened the map again. Tried restarting both my PC and Osu, didn't help.
Video or screenshot showing the problem:
osu! version: 20150414.2 (latest)
Video or screenshot showing the problem:
osu! version: 20150414.2 (latest)