Sorry I can't make out a great deal from that screenshot. It's pretty low res. But it definitely is a green blob.

Does this effect occur on just a single surface or on the whole prop?

Is it all props and figures that do this, or just this particular item?

Is it all shader types such as Iray or 3DL shaders?

Do you have any errors in your log file when starting DS, you can access the log via Help/Troubleshooting/View Log file?