When the file settings have UNITS set to FEET & INCHES
You cannot create multiple circles of the same size by clicking and pressing . You have to retype the radius.
If the UNITS are set to DECIMAL, you can just hit and get a circle of the last size.
The same problem exists with the SCALE command.
The last scale factor is displayed as inches.
FWIW . . .
A large part of the problem appears to be the result of Rhino’s input and out for fractions being different.
If I input
5’6-7/8"
Rhino’s output that goes into the text boxes is:
5’-6 7/8"