I have a big problem with rendering. The unwanted strange rectangle always appear in some frame in the middle of the scence. What's wrong with it. How to fix it! Please help!
You need to give us a sample picture or Moho file. I don't know what this rectangle is. I fyou don't have a website to upload it to, you can email it to support@lostmarble.com.
Are you using a Shading Effect (with high Offset) in some of your Layers, there is an ugly bug in this that "proyect" a shadow of the frame in final render , a Pity, isn't?