Hi Axel,

re:
> Why does the center of a circle disappear?

Basically because it's the same behavior as all curves - once you have drawn a curve points that you used to generate the curve are not displayed anymore.

But it can be targeted by object snaps.


re:
> the division in quarter and half is gone as well.

Could you please describe this part a bit more? I'm not understanding this part.


> Also I observed that sometimes after drawn a circle, the input for editing shows x & y instead of
> diameter or radius, though I draw the circle from the draw curve menu. Is there a certain pattern
> I maybe overlooked which MOI uses here?

This happens because when MoI is analyzing the shape of the curve to determine if it's a circle shape it uses too tight of a tolerance and if your circle is kind of small then there is enough noise inherent in floating point calculations that makes a deviation greater than the overly small tolerance value.

I happen to have tuned this up recently for the next v5 beta, smallish circles should behave better there.

- Michael