I just downloaded the latest version and it's great to see you continually improve SSC.
A few minor issues:
1. The Welcome Help page says version 3.15.1 but I guess it should be 3.16.1?
2. If you add a caption and then undo it, you have to press Ctrl Z twice, first to remove the caption, then second to remove the white area beneath the caption
3. The same goes for other undos, such as try using Edit->Crop with border effects. Maybe this is intentional to allow selection undo's of the various steps to achieve the cropping?
4. After starting SSC, I tested the Caption functionality and added a caption. However after adding the caption, the selected area isn't the full image. It seems to to be the selecting what would have been the size of the original image. A second capture and the selected area resembled the area of my first capture... Sorry if I am not explaining it correctly.
If I get a chance I will continue testing and report back.