Well something really bad is happening. I hoped the problem is with other plugins/assets that I use, but it's not. I've just created a fresh fersion of Unity editor (3D template, 2018.4.2 f1) and downloaded the latest version of Obi. Opened the "Wind" scene, selected Flag2, opened particle editor and pressed play and the editor crashed instantly.
I have sent a bug report to Unity and I am attaching the project, the screenshots of what I did and the crash files (that were sent to Unity with the report) to this answer - in case you want to look at them.
https://drive.google.com/file/d/1Fl_vn7c...sp=sharing
Yeah one more thing, these were the errors I saw when I imported Obi into the new project:
I have sent a bug report to Unity and I am attaching the project, the screenshots of what I did and the crash files (that were sent to Unity with the report) to this answer - in case you want to look at them.
https://drive.google.com/file/d/1Fl_vn7c...sp=sharing
Yeah one more thing, these were the errors I saw when I imported Obi into the new project: