Try deleting everything in this folder, I think that should help:
C:\Users\*username*\AppData\LocalLow\Glitch Pitch\Idol Manager\data\cache\portraits
Have you ever installed any mods?
If not, please upload somewhere or send me to sadambober@gmail.com these files:
C:\Users\*username*\AppData\LocalLow\Glitch Pitch\Idol Manager\Player.log
C:\Users\*username*\AppData\LocalLow\Glitch Pitch\Idol Manager\data\global_data.json
And any of your save files that don't work
C:\Users\*username*\AppData\LocalLow\Glitch Pitch\Idol Manager\data\manual_saves