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Here are the steps I follow to reproduce the issue:

1. Forget I’m in mm mode
2. Set G64 P 0.0003 in 3D_Chips.ngc
3. Run 3D_Chips gcode

This is what I expected to happen:

run normally

This is what happened instead:

following errors from acceleration violations (large position steps)

It worked properly before this:

Not sure 2.7.11 and Master have the same issue

Information about my hardware and software:

local build
* I am using this Linux distribution and version (often, shown by lsb_release -a):
* I am using this kernel version (shown by uname -a):
* I am running …
* [ ] A binary version from linuxcnc.org (including buildbot.linuxcnc.org)
* [x ] A binary I built myself
* [ ] A binary version from some other source besides linuxcnc.org
* I am using this LinuxCNC version (shown in package manager or, for git versions, scripts/get-version-from-git):
* I am using this user interface (GUI) (e.g., AXIS, Touchy, gmoccapy, etc):axis
* I am using this interface hardware vendor and chipset (e.g., parallel port, ethernet port, FPGA card):
FPGA