I'm in the process of calibrating my new Prusia I3 rework and I have experienced a problem in Pronterface. All features appear to work properly except when I try to input data into the "Length" and "Speed" fields to advance filament, neither field will accept input. I am running on a Windows 10 platform with Printrun version 2014.08.01. Attached is a screenshot which illustrates the fields in question. If anyone can assist me in understanding what may be causing this problem, I would be most grateful.