I've been adding some macros and tidying up my Cortex, saving the database every so often to ensure that I don't lose all my hard work!

I've now found that two of my rooms, with all their objects, have disappeared from the plan view. The rooms and objects are all there in the structure view and everything is working. I can't find a way to bring them back - they are not hidden behind anything as far as I can see.

I'm sure there's a simple solution, but what is it?!