@ Blackbeard1970
This bug was reported back in August last year (2014)
Since “Thumbgen” is no longer actively updated or developed by the original author it’s a broken feature.
http://community.wd.com/t5/WD-TV-Live-Streaming/Wanted-ThumbGen-Expert/m-p/783553#M32547
However, the code is now “open source” … so it would take someone with .net programming skills to fix it.