I tried to find something about this bug but found no answers, even though it seems incredibly common. After about a year and a half of in-game time, every event or audition I get has the blurry screen, and I can click on the background to change things/swap idols and such (with no effect since the clock is stopped and doesn't restart). I got 2 saves locked because of this bug now, and I don't want to start a new game just to see everything end like this.
Please try deleting everything in this folder, this might fix auditions for you:
Win: C:\Users\*username*\AppData\LocalLow\Glitch Pitch\Idol Manager\data\cache\portraits
Mac: ~/Library/Application Support/Glitch Pitch/Idol Manager/data/cache/portraits
Also, I don't think it's your case, but this could help too: https://img.itch.zone/aW1nLzI3MzUyMDEucG5n/original/SAD%2F2A.png