Some text seems to be unsharp / blurry.
As you can see in the image here, the 1th, 3th, 4th and even the 5th line is blurred.
These are all text grouped with the blue rectangle.
The artefact is only visible when previewing the Prezi and not in editor mode (online).
Since i’m doing screencaptures of those Prezis, the result is not satisfied.