Am Dienstag, 18. Oktober 2016 um 10:12:50, schrieb Paola Manzini 
> Hi all,
> I’ve searched the list and though this is not the first time the problem is 
> noted, I haven’t been able to find any solution. The short of it is: it just 
> won’t work. So for instance if I type “5+2” then invoke Edit/Math/CAS, I only 
> get a lonely = side to the right of the expression, and no result (see 
> screenshot)
> I am currently running Lyx 2.2.0 on Mac Os Sierra, but I had exactly the same 
> problem under Maverick and El Capitan with previous Lyx versions, namely, 
> nothing happens.
> I have specified the paths correctly (I think) to where the apps are 
> (Mathematica, Maxima, Maple - nothing seems to work), and I can see the 
> software calling the app (math-extern maxima), or (math-extern mathematica), 
> but no result is churned out.
> Here is what I have in the "PATH prefix" field under Lyx->Preferences->Paths:
> /Library/TeX/texbin:/usr/texbin:/sw/bin:/sw/sbin:/opt/local/teTeX/bin:/opt/local/bin:/Library/TeX/local/bin:/Library/TeX/bin:/Library/TeX/X11R6/bin:/Library/TeX/sbin:/sbin:/usr/local/sbin:/Library/TeX/usr/local/bin:/Applications/
>  18/Maple
> Can anyone please help?
> Many thanks,
> Paola
> []

I'd try calling lyx with '-dbg mathed' parameter from a console window.
Alternatively use View->Messages Pane->Settings
        Check 'Selected'
        Double click on 'mathed - Math editor'
        back to 'Output'
        calling: maxima
        input: 'simpsum:true;tex(5 + 2);'
        output: '7'
        Buffer.cpp (3449): updateMacro of novýsúbor9.lyx
        12:31:27.889: Automatický úklad hotový.

Here it shows:
        12:38:28.705: Alt+M Afinding 'finding 'finding 'use whole cell: 
checking expr: '5 + 2'
        calling: maxima
        input: 'simpsum:true;tex(5 + 2);'
        output: '7'


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