LinuxCNC Install using MX Linux 19.4 - Geared Toward New Users

I am still having odd errors coming up and need some directions.  I am getting error related to the latency test, I was told by another member to run the test and note the max jitter and write it in the box when running Pncconf.  I did that and still get the error, tried different time same result.  Also when I run Pncconf and then correct the missing folder (/examples/) and run QTPlasmaC it tell me a restart system is needed.
I also tried to add some missing custom buttons see list attached, but it was a total fail.  Entered as they appeared on the list.  In an older version I did add a simple command move torch to laser cross hair location and it worked (G1 X-5.XX Y-2.XX f70). I entered it under a page in the GUI followed with a save.

acourtjester wrote:

  I am getting error related to the latency test, I was told by another member to run the test and note the max jitter and write it in the box when running Pncconf. 

Whoever told you to do that has no clue about how stuff works in LinuxCNC as servo period is normally never changed from the default 1000000 (1 million). The only usable reasons for changing the servo period is when using a really old/bad PC or when wanting faster position updates from Mesa boards.
The above advice is valid only for use with parallel port and StepConf, and even then it is not very good as the value entered should always be higher than jitter value.
Set it back to 1 million and report back if it works or not.
The error you posted can also be caused by network cards, so what network card is in use?

I am using a Dell AIO PC OptiPlex 3050 and it has a
Realtek RTL8111HSD-CG Ethernet LAN 10/100/1000M on system board for connection to the Mesa 7i76e
I worked well with the Bulleye's version of LinuxCNC before I switched to 19.4.

The restart message is telling you to restart LinuxCNC, that is because an update was done that modified the ini file. 

What is the exact issue you are having with the custom buttons. 

Thanks for the reply, the problem with the buttons was, I added some from the list when in Pncconf. And the next restart of the GUI the message was displayed (attached below). I went back in to Pncconf and removed those additions and did not have the error again. In a different version I had added a button to move the torch to a laser marked position (simple G-code instruction) with out a problem.
My thought was while in Pncconf that was how I add new buttons and used the example from the list as the format for them to be installed. Now after that it seems they should be added to one of the optional files for the GUI from the manual.
15.1. Custom User Buttons
The QtPlasmaC GUI offers user buttons that can be customized by adding commands in the USER BUTTON ENTRIES section of the SETTINGS Tab in the <machine_name>.prefs file.

another post I made about the buttons in the past
forum.linuxcnc.org/plasmac/50130-custom-...on-qtplasmac?start=0

In the attached picture, the servo period is still 151xxx, that will not work, change it to 1 million.