I'm sorry if this is a repeat or has been fixed in V3. I've noticed using V2 that if I paste a value in, while for example creating a circle and entering it's diameter/radius, the (circle create) script quits out without doing anything. If, however I first create the circle, then select it and edit the diameter/radius, pasting the same text works!

An example of the kind of text I was pasting, I was just using "4.7625" (without the quotes, copied from the result of a Google unit conversion for "3/16in to mm").

Thanks,
FDP