I am trying to open an g code in Mach4 hobby and it always just sits at "tool path progress" at 0% and never loads. If you cancel and hit Regen tool path , same thing.

I've tried the sample codes that come with Mach4 and always the same result. Somebody please help me!!

Well, I don't know what I did, but it seems to work for now. I even ran some code. Fingers crossed.

I know the thread is old, but I started having this problem with every new gcode file I created after about March 10.  All my pre-March files load into Mach-4 Hobby just fine.   I use Fusion360 to make the g-code. 

Does anyone know if something changed in Fusion360?  If so, do I fix the problem by changing a setting in Fusion or in Mach4.  My Mach4 version is about 2-3 years old.

Thanks for any help.