Hey Federico,
I just finished getting full unicode support on Pd-extended 0.43.4 and ran into a bizarre problem. It turns out that when tclpd is loaded by default, Pd freaks out on some Portugeuse text like "modulação". Replace the ç and ã with c and a, and the problem goes away. Or stop loading tclpd at startup and the problem goes away. I attached the patch in question. This only happens on GNU/Linux, Windows and Mac OS X are unaffected.
I tried looking around the code, and using strace to follow the function calls, but I didn't see anything. I'd like to be able to include tclpd by default in Pd-extended, but this is a show stopper.
.hc