Hi, RENE
1. This is a setting in, Config, Gereral Configuration page, Use (Init. Sting on ALL "Resets"), If checked it calls the Initializations String below it on Reset, You can put G-code/Calls in it as defaults, see Picture.
2. You can turn it off, But it's an indication you may have something going on in the "Windows" background interfering with Mach's Driver, You may need to do some optimization of Windows, QuickTime program can cause problems, look at the optimization list.
Hears a Link.
http://www.machsupport.com/downloads/XP_Optimization.txtHave you done a Driver Test ?
3. Settings Page, "Over-Ride Limits", Turn it "ON", Reset, Jog off switch should work. Are your Limit switches in series or parallel, NC or NO. ?
Hope this Helps, Chip