No thick blue line shown on the external perimeter and no thin blue line shown on the partitions

Hi there,

I've been using Hevacomp for only a month. My colleagues showed me that external walls are normally marked in blue colour (thick line), whereas the partition with a thinner blu line, and the rooms get yellow when hovering the mouse over them. The model I'm working on only shows black thin lines on a white background. Also, when I add a room next to an existing room, the existing room doesn't update the partition wall but keep it as an external wall. I think the problem is linked to the one above.

Many thanks in advance for your help!

Carlo