Logic Pro wont open since I upgraded to 11.2

1. Which version did you update from and to? The most recent Logic version is 11.2.2 and the Macos is 15.6.1
2. Are all plugins compatible ?
3. What computer Model are you using?
4. Are you running Logic in Rosetta or native silicon?
5. Look in Utilities > Console > Crash Reports. Maybe you find a hint.
6. Have you created a backup of Logic (and your entire computer) before upgrading? You can place several Logic versions in your Application folder as long as you rename the old logic versions into something meaningful like Logic Pro 10-8-1 (avoid special characters other then "-" or "_").

Back up Logic Pro for Mac - Apple Support

When you say it crashes, do you actually see the Logic menu bar disappear from the screen, or is it just that your project doesn't open up on the screen?

1. Press cmd + tab. If Logic's icon shows in the list of running apps, then highlight Logic's icon and let go of cmd + tab.
2. Now press cmd + 1. This selects the Open Main Window command in Logic's Window menu.

I've opened projects and not seen them on my screen, but cmd + 1 always makes them show up.

Why that happens, I don't know.

Hi

Is this issue with one (single) project, or any/all projects, including a new one made from an empty project?

CCT