I've installed Sweet Home 3d on 2 computers (Windows using the Windows store version). The first works fine, but I'm unable to edit using the second because it keeps giving me a nag screen about buying. What's going on?

The 0,0 coordinates on the grid have moved to the far lower right of my screen. Is there a way to move it back to the upper left?

I used these instructions to create a vaulted ceiling:

1. Draw your room walls at the standard height.
2. Create a new level above the existing one.
3. Go to the new level and draw sloped walls that rise from the level below.
4. Adjust the "Height at start" and "Height at end" for these new walls ...