[Therion] Metapost / Tex error when compiling my projects on a new machine

[Tom Foord]

Hi everyone

I'm hoping someone can shed some light on a weird error I'm getting when
attempting to compile my projects on a new PC.
All of my projects are stored on Dropbox and are compiling successfully on
other machines.
But on my new laptop (a Dell Inspiron running Windows 10 with a fresh
install of Therion 5.5.7) I am getting the same error every time, across
all projects. It appears to be some issue with Metapost and/or Tex (neither
of which I really understand to be honest). Here's the relevant bit of the
log:

####################### metapost log file ########################
This is MetaPost, version 2.00 (TeX Live 2020/W32TeX) (kpathsea version
6.3.2)  7 APR 2021 08:23
**data.mp
(c:/Program Files (x86)/Therion/texmf/mpost/mpost.mp
(c:/Program Files (x86)/Therion/texmf/mpost/plain.mp
Preloading the plain mem file, version 1.005) ) (./data.mp
{randomseed:=42}
 [4001] [4002] [4003] [4004] [4005] [4006] [4007] [4008] [4009] [4010]
[4011] [
4012] [4013] [4014]
[4015] [4016] [4017] [4018] [4019] [1] [2] [3]
>> data.mp
>> data.mpx
! ! Unable to read mpx file.
l.7129 p_label.rt(btex
                       \thlabel\thnormalsize \thfb\char99 \char104 \char111
...
The two files given above are one of your source files
and an auxiliary file I need to read to find out what your
btex..etex blocks mean. If you don't know why I had trouble,
try running it manually through MPtoTeX, TeX, and DVItoMP



Here is how much of MetaPost's memory you used:
 2803 strings using 61450 characters
 2313328 bytes of node memory
 1659 symbolic tokens
 8i,82n,13p,312b,2f stack positions out of 16i,98n,15p,312b,4f22 output
files written: data.1 .. data.4019


#################### end of metapost log file ####################
C:\Program Files (x86)\Therion\therion.exe: error -- metapost exit code -- 3
writing xtherion file ... done



Any ideas?

Thanks
Tom Foord
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