Re: detailed 'diagnostic' of MikTeX/Lua*/fontspec issues

>> The termination always occurs after it has started scanning my
>> working directory (which happens to be the Desktop for my
>> account, which again is an admin account).
> Then I would suggest to test if it works if you change the working
> directory to a folder with a simple name - the desktop can contain
> problematic chars.
>
>


This suggestion definitely helped. Now, luaootfload-tool successfully 
rebuilds the FNDB.  So, definitely a step in the right direction. My MWE 
(below) compiles, more or less. Turns out something is balking on 
unicode-math.  If I try to compile the MWE as is, I get the following error:

))(load luc: 
$TEXMFCACHE/luatex-cache/generic/fonts/otf/xits-math.luc)(load luc:
  $TEXMFCACHE/luatex-cache/generic/fonts/otf/xits-mathbold.luc)
! Undefined control sequence.
\um_set_mathcode:nnn #1#2#3^^@-\Umathcode
                                         \int_eval:n {#1}=\mathchar@type 
#2\c...
l.6 \setmathfont{XITS Math}

?

Basically, it chokes on unicode-math.




documentclass[11pt,letterpaper]{article}

\usepackage{fontspec}
\setmainfont{XITS}
\usepackage{unicode-math}
\setmathfont{XITS Math}

\begin{document}

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent in 
tincidunt nulla. Donec quis laoreet est. Aenean vitae est felis, a 
venenatis magna. Mauris semper bibendum vulputate. Etiam bibendum quam 
ut erat rutrum consequat.

\begin{equation}
\frac{dN}{dt}=rN\left(1-\frac{N}{K}\right)
\end{equation}



\end{document}
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