This page lists some common issues and how to fix them.
Chunky does not launch anymore (Windows)
If you installed Chunky using the Windows installer and later updated the Java installation, Chunky may stop working because the path to the Java-installation has changed. This can usually be fixed by uninstalling Chunky and reinstalling it again.
I try to create a new scene but it is empty
First, make sure that you have selected some chunks before creating a new scene.
If you still have the problem it may be caused by the "Y cutoff" setting. The "Y cutoff" setting in the Render Controls window can prevent the blocks from being loaded, especially if you are loading a superflat world. All blocks that have a Y value (height) less than the Y cutoff value will not be loaded.
The problem can be fixed by setting the "Y cutoff" value to 0 in the Render Controls window and then reloading the chunks, or creating a new scene.