This especific problem is now *solved*.
Thank you for your support jgnoss!

In fact, our files were pretty similar, but I noticed something trying your 
example
example:
$ /usr/bin/config-pin -q P9.23
P9_23 Mode: default Direction: in Value: 0
$ /usr/bin/config-pin P9.23 out
$ /usr/bin/config-pin -q P9.23
P9_23 Mode: gpio Direction: out Value: 0

or

$ /usr/bin/config-pin -q P8.11
P8_11 Mode: default Direction: in Value: 0
$ /usr/bin/config-pin P8.11 qep
$ /usr/bin/config-pin -q P8.11
P8_11 Mode: qep

my config-pin was *not working* properly, as I suspected. As you said that 
you changed nothing and using the same kernel (4.19), then I realized I may 
be using a different version of config-pin.

So, the one I was using and I modified (wrongly expecting to work) is this 
one:
https://github.com/cdsteinkuehler/beaglebone-universal-io/blob/master/config-pin

The one that did solve my problem is the one by* Bjorn-J forked from 
RobertCNelson/bb.org-overlays*:
https://github.com/beagleboard/bb.org-overlays/blob/master/tools/beaglebone-universal-io/config-pin

Case closed. Now, to keep working until a new error appears.


Sergio Salinas

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