If you are not getting the rubber-banding line to indicate a radius of a circle or a length of a line etc. If you tab straight to the data fields and input the value, it draws the object to the correct size, but there’s no way to visualize on the screen where to place a radius, endpoint of a line etc. 

This problem has only occurred since the latest Windows update (1709). The problem affects both new and existing drawings.

For now, the only solution is to run TurboCAD in GDI mode i.e. Options > Native Draw > select GDI mode > checkmark Flicker free draw > click yes to restart TurboCAD.