I am using Mach3 Version R3.043.066 with parallel port under Window 7SP1 32 bits.
The USB Xbox 360 controller  (original Microsoft hardware + Plug-in by Lee Davis' version 2.4.1.0.) works correctly on boot up but after Mach3 [Ref all home] using limit/home switches,  most of the buttons on the xbox 360 would lose their functions.  Some part of memory are being overwritten? The joysticks luckily still work.

I have tried downgrading to Mach3 Version R3.043.062 but the behavior remaains the same. The Xbox controller always work correctly when I tested on Mach 3 under Windows XP SP3. i have a dual boot win7 + XP PC.

(sorry, I am not going back to XP because Nvidia does not provide videocard drivers for XP anymore).

Anyone knows how to fix the problem?

Thanks in advance.

It's bizarre!
I just changed the Look Ahead under General Config to "150 lines" and now the Xbox 360 controller works correctly under Windows 7.

Thanks everyone

Attachment is my config for the Xbox 360 controller FYI