Ok, thank you.
Yes, I do have mylocale loaded, which includes en_US.UTF8 (for compatibility) and several variants of (GT, MX, etc) es_ES.UTF8 (the 'original' standard as well, I can't remember, CP8088-2?, something like it).
What I have loaded is:
mylocale.tcz (generated from the script in the repo)
Xorg
JWM
aterm
libreoffice_lang
libreoffice
When loading there is no obvious error on the console output.
It doesn't matter what's the order I load the extensions, the result is the same. I will try to download all files again, since I'm using local files I downloaded a couple of months ago, maybe I screwed something up.
Let's see.
I will come back with the results.
EDIT: Added info. about mylocale.tcz