Looks like a graphics issue, possibly drivers.
Firstly make sure you are working in Pixel Shader mode. You can check in the top right of the preview window or by going into Preferences (CTRL+P).
Please take a look at the System Requirements below to make sure your graphics card is one of the supported cards for iClone5.
If it is, check with your computer manufacturer for latest drivers, or from Nvidia, AMD or Intel. You may well find that the problem will go away as soon as you update those drivers.
And one polite request. Please don't post images larger than 1000 x 1000 on the forum. Very large images destroy the formatting of the forum, and make it difficult to read the accompanying text. Thanks.
Peter
Forum Administrator
www.reallusion.com