If you are getting a pixilation smudging, or motion blur that looks similar to compression artifacting, it can be the result of your Wirecast encoder. Versions of the software before 5.0.3 have known issues broadcasting over the Akamai CDN (Content Delivery Network).
If you are using 5.0.1, or a version of 4.X, it can cause playback problems. These issues are demonstrated below. Still elements are often okay, but any movement or screen changes will cause issues in the presentation.
Sadly, the only solution for better playback is to update your encoder to 5.0.3 or above. This is a free upgrade for Wirecast 5.0.1 and 5.0.2. Unfortunately to upgrade from version 4 or lower is not a free upgrade; it costs around $129 as of November 2014. Here is the page to upgrade for Windows and the page to upgrade for Mac.