Mark,
When the Data Register Speed Mode is on, if we click on "Show Add Data" in the Prices section of the Data Register to do some operations on older prices (add, update or delete...), at each operation the Data Register refreshes and we have to click "Show Add Data" again because the Speed mode is re-activated after each refresh. Maybe when the user has clicked on "Show Add Data" this should be enable as long as the price section is active (or the current Data Register window is open).