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Update : Looking at my tlmgr.log, I saw that 'l3packages' was one of the packages updated this morning. Seeing error messages related to 'l3packages', I tried to restore a previous version (morning and actual: 24821; restore trial: 24656) to see if the problem could be solved in this way, but it ...

I tried again updating my tl, from the mirror server tlmgr gives me by default (http://ctan.mirror.garr.it/mirrors/CTAN/systems/texlive/tlnet). Only the package siunitx was updated.
At the moment, all seems to work properly; I had no problems, even compiling my actual document. I have no clue about ...

Hello warpino,
If you have not updated to a more recent version of siunitx yet, I suggest you to keep up with these errors, as they behave just as some of lesser bug and still do compile the document properly.
If you don't want these errors to appear, be sure you do switch your file encoding to utf ...

I am sorry to have not listed all the combinations I tried. They are:

1) The original example, with iso-8859-1 encoding and \usepackage[latin1]{inputenc} reported the error while still generating a document as I expected;
2) Switching the encoding or the inputenc parameter to utf8 did not produce a ...

Are you really sure the file encoding is ISO-8859-1?
I'm quite sure about the encoding. The output of a file-mime-request on the .tex file is something like that:

me@home:~/TEST2$ file -ib test3.tex
text/x-tex; charset=iso-8859-1



On Linux systems file encoding is usually UTF-8. What happens ...

%%%%%%%%%%%%%%%%%%%% Added on 14 Dec 2011 %%%%%%%%%%%%%%%%%%%%
Summary: The package siunitx (version < 2.4e) was found giving errors ("Invalid code 84XX") on unit declarations when using a particular input encoding ( latin-1 ), while still compiling the tex code properly. The problem was encountered ...

Hello to the whole community here!

I'm an chemistry student from Italy and feel as a "false beginner" in LaTeX topics. Up to now, I've been writing documents in LaTeX for about a year and a half.
Usually I write documents containing lots of math and chemistry.

My first question is: where should I ...