Version 23 cleaned up how vectors look on screen. Historically, "Preview Mode" and "Pixel Preview" were very different.
A major departure from linear and radial gradients, this tool allowed users to create complex, photorealistic color blends by placing individual color points and lines anywhere on an object.
Remember, v23 is the last version to officially support some older OS environments like Windows 7.
Since V23 was a major architectural shift, it had specific bugs that users still encounter.