I’ve had the same issue with the Logical Editor crashing Cubase 12. Here’s a fix: When you’re about to open the Logical Editor be sure to save your project. Open the PLE and DON’T TOUCH ANYTHING in the interface yet; give it two or three minutes to get in touch with its feelings. I’m serious. Do something else on your project. After a few minutes, take a deep breath and choose a logical editor pre-set. Pause again for a good count to ten before hitting “apply”. If it applies your pre-set as it should, you’re good to go. After this it will work as it should, without the pauses. I know this makes no sense but it works for me nine out of ten times. I have to do this if I’ve just opened Cubase for the day, then it works fine. For some reason the program freaks out if you rush it when it’s just been opened. Good luck!