Cosmo 3 problems

I just placed a door on a deckplan. The background for the entire map then changed colour. When I attempted to zoom out the entire map vanished! All the map entities are still there (4909 of them) but nothing is visible. Then there is this, in the coordinate box it reads the following;
T: NAN,NAN or
@T: NAN,NAN etc
What does all this mean. Is the map lost? Or can it be recovered?

Also the cursor has vanished. I tried to measure a distance on the map using the invisible cursor. It returned this
Distance = NAN

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