Spindle control wonky

Hi all having a strange problem .I programmed a new part .when I load it into my milling machine the spindle won’t run? If I run it on the home screen it goes slow . Delete the program all works as it should .Any ideas I have been running sheet cam for 20 approx years started with mach2

We’re going to need more info to help diagnose this.
What is your milling machine brand and model ? and controller brand and model ?
It also may be easier if you created a support.zip file and sent it to us, don’t post it here as it has your license in it.
See this post instructions- Creating a Sheetcam Customer Support file

Mach3 did a reboot and all has fixed itself .think it helped I said a few bad words to it !