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www.suse.com/security/cve/CVE-2023-52993.html says this is a Linux kernel vunerability. Might the latest version of linuxCNC fix this?

GRUB_CMDLINE_LINUXCNC_DEFAULT="lapic quiet rootdelay=5"

I do not see "nosplash" anywhere in /etc/default/grub.

Also this has worked perfectly on this hardware for years until yesterday,

I think you are measuring the enable pins (1,2) rather than the analog outputs
(3,4)

I use stepper online dm542t and dm556 have over 50 of them in operation on machines running at least 8 hours a day and have never had any issues with them. I have never measured the current to see if they are getting 3 amps but I will say they are stronger than any of the tb6600 boards I've seen.

Hi Tommy,

Thanks for your answer. 

I have disconnected all drives and measured directly on the pins. (Indicated with the red dots on the image)

It doesn't matter what I set hm2_7i94.0.7i77.0.1.analogout0 to, the value stays 0V, or about 0.3V when hm2_7i94.0.7i77.0.1.analogena is enabled.