Roof problem

[Bluebottle]

Lately, whenever I've placed roofs on houses they're extremely low, regardless of how wide or long I make them, and well, it's now impossible to build attics (and it looks stupid).
It's been a little while since I've done any building, but I'm pretty sure it wasn't always like this. If I'm not just imagining things, can anyone suggest what might have changed it?

[Hook]

Open the cheat window and type "roofslopeangle 45" to get the original roof back.

Hook