A common complaint from users of the newer versions of AutoCAD is that hitting the Up and Down arrows now show coordinates instead of the last distance typed in. If this bugs you as much as it does me, try this:
Type in INPUTHISTORYMODE and Enter 0 – You will now be able to recall those distances you typed in.
Other values of INPUTHISTORYMODE:
0 – No history of recent input is displayed.
1 – History of recent input is displayed at the command line or
in a dynamic prompt tooltip. Access with the Up Arrow and Down Arrow keys at the
command prompt, or at an input prompt.
2 – History of recent input for the current command is displayed in the shortcut menu under Recent
Input.
4 -History of recent input for all commands
in the current session is displayed in the shortcut menu under Recent Input.Note that like many AutoCAD variables, this one is bitwise which means
add up the numbers of the features you want and use that value.
8 -Markers for recent input of point locations are displayed.
Use the arrow keys on the command line at a prompt for specifying a point
location.
Like many AutoCAD variables, INPUTHISTORYMODE is bitwise, which means add up the options you like and type that value in. 15 is the AutoCAD default (1+2+4+8)
The H-Factor 
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