Why do I get coloured blobs on my renders?
There is currently a bug in the 3Delight render engine used by DAZ Studio which may produce coloured squares on renders using Depth mapped shadows. If you encounter this there are several things you can try:
Use ray-traced shadows instead of depth-mapped shadows - select your lights and if there is a Shadow group in the left column of the Light or Parameters pane click to seelct that group of settings, then check the Shadow Type property. If it is set to Deep Shadow Map switch it to Raytraced (Software only). Note that ray-traced shadows can be slower than mapped shadows, especially if there are a lot of transparent or semi-transparent surfaces in the image.
Lower the intensity of your lights so that the total adds up to no more than 100%. This may make your image too dark, but you can compensate with the Gamma setting in the Advanced tab of Render Settings.
Try slightly adjusting the position or rotation of your camera - sometimes that will remove the issues.