First of all thanks for the new version 2.3. I rendered the same scene, which contains only one cube, in versions 2.2 and 2.3. I noticed the following. In contrast to version 2.2, the setting "Quality High" in version 2.3 renders twice as fast. Bravo!
BUT there is a new problem: In version 2.3 the setting "Quality Medium" is not faster than the setting "Quality High" and the result is identical as if both settings work with the same high quality.

If you set a camera position to 0°,y,0° at point 0,y,0, the program DN (2.2.1.) collapses under MacOS 10.14.5 (MacBookPro 2012). See Screenshot.

Upon rendering a plane with the Glass material selection applied to it, the background image will be warped depending on which face of the plane you are looking at.

I have added a background image, placed a normal plane object on the scene, set the object to have the glass material applied to it, then previewed the render. If the plane is facing one way, the background image is very warped, whereas if you turn the object around 180 degrees, the background is no longer warped (note the Z axis rotation).

The library cannot be loaded (clickable but all white) after renderring