Bizarre behaviour of dimensions

If I open a new file, and draw a circle, I can dimension it easily and it looks right.

But in this drawing I've been working on, if I try to dimension a circle, all I get is a horizontal line on the X axis, with nothing else. What kind of switch could I have flipped to cause this behaviour? I've looked through all the properties and can't find anything. Maybe I will have to copy all my work to another file and start again?

It sure would be nice to know what I did so I don't do it again.

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