I am trying to us Orbitron v3.71. Have delete and re-installed but the problem persists. I have tried running as XPsp3, Vista, and Win7 compatibility and as administrator. So far nothing has corrected the freeze problem. In the frozen mode, only operator input is frozen, the program still computes the orbit and updates the track on the screen. I just cannot make any changes thru the tabs or the pull down in the upper right hand corner of the screen. The program runs fine on my old Gateway with XP, but I really don't want to have to lug the heavy laptop, when I could use my light weight laptop.
73
Dick - KC3EF