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jpg wrote:

Spumco hasn't said anything since... 

I've been on an LCNC hiatus for 6 months due to some other work eating up all my free time.

I've still not gotten the new spindle motor completely hooked up and tested, much less tried Aciera's fix.  Hoping to get back to it in the next month or so now that the outside work has finished.

I found the probe signal problem and got the EasyProbe screen to come up.
Something is still wrong - clicking any probe button gives an error:
EOF in file: /usr/share/axis/images/axis.ngc seeking o-word: 0<probe_x_minus> from line: 0
I also do not have the Probe Signal LED working. So, my "fix" of the probe input error must have broken something that does not cause an error message on startup.

It also gives the following error when I press the home button:
"emc/task/taskintf.cc 976: Error on joint 0, command number 74"
if that helps at all...

I made sure that they agree.

Do you know what
"(PREOP + ERROR) could be caused by? or "Invalid input configuration"?

Also, did you take a look at the .hal and .ini file? There are a few things in the .hal file that I don't know the purpose of, yet LinuxCNC doesn't run without them, so I'd appreciate an explanation of why they're necessary-if you're willing.

Personally I would suggest tp use the .comp format:

linuxcnc.org/docs/2.9/html/man/man9/userkins.9.html

But regardless,
Forward kinematic uses the joint positions to calculate the cartesian coordinate positions 
Inverse kinematic uses the cartesian coordinate positions (ie the position commands of the motion planner) to calculate the joint positions (ie basically the commands that get sent to your motor drives)

One needs to be the mathematical inverse of the other (otherwise the values will run off and you will get limit violation errors)