Could there be a reason why my display mode button does nothing?
It has this VB code in it ...

value = GetParam("Boundry")
if  value = 1 then
SetButtonText " Job "
SetParam "Boundry" , 0
 else
SetParam "Boundry" , 1
SetButtonText "Machine"
end if

So I am going out on a limb here and guessing the button text should change when pressed but mine always says "display mode" and seems tot do bugger all.

Just wondering

Also, is there a zoom-to-fit option anywhere??

Also, is there a zoom-to-fit option anywhere??

Don't have a copy of Mach3 here, but try double clicking in the toolpath window.

No idea about the other issue.

Double-Click in my window and it just resets any scrolling etc to standard view

It fit's the entire toolpath into the window. If your g-code has commands that send it far away from your part, those are included.

Not working I don't think then, It does change the cross-hairs at 0/0 to dashed lines but that seems to be all it does, I think the text does not change as this screen-set uses button graphics and not plain buttons.

Sounds like it is working then.
DO you have the correct values for your softlimits? That's what tells Mach3 what the table size is.

Fixed it !

You have to press "Regen Path" after pressing the display mode button, I have added DoOEMButton(160)'Regen Path to the display mode button now and it all looks better, the text will not change but hey-ho