I have been experiencing a problem when trying to create circles of very close diameters in that the second near circle just disappears when I press enter having carefully selected the required size. the attached image shows two outer circles created by selecting a slightly wider distance that I would have liked but this was the closest I could get it. The inner 2 circle are as required but the larger is just about to disappear as I press enter. Are there default constraints on how close these circles can be to one another. I have tried turing off OSNAP btw.