Used for years, now impossible – Sketchbook® Review

I don’t know what happened, and I hate giving the app such a low rating, because I’ve truly loved it for so many years. But immediately at 6 pm today, the app became unusable. The second it’s opened, it crashes and doesn’t let it open at all for more than a few seconds. I restarted my phone, updated my iOS, and even deleted and reinstalled the application (much to my dismay, as I lost all my work) to no avail. I am devastated, and judging by the online community forum, this is a problem many people are having. I would be most pleased if a solution was found to this.
Review by Zarouhi on Sketchbook®.