Is this a matter for Tech Support or can someone on the forums tell me...

[Keith_K]

Thank you all for your contribution to this thread.

Just to let you know that Leanne from Tech Support suggested that I delete all the round and oval handbasins in the bathrooms (bathroom sinks to those in the USA) which I had used from the HD Core Catalogue library to see whether this would improve things.

It did and everything is back to normal. Why this made such a difference, I don't know, but if it did the trick that's enough to make me happy.

I suppose I would probably be chancing my arm if I put all my pretty walls back to how they were.