Floorplanner Help

I created a 3d floorplan quite some time ago using floorplanner.com and its served me well for some time but I now need to make some changes but for the life of me I can’t get a render like I had before

Here is my previous render:

As you can see the lighting is very uniform and that’s what I’m after

But now I’m getting this:

With shadows, dark areas, uneven lighting

Can anyone help with settings or something that I’m missing on floorplanner to get a rendered output like I had before?