Getting the following error when launching:
$ ./start.sh
Running Tex Murphy: The Pandora Directive
Starting DOSBox
DOSBox version 0.74
Copyright 2002-2010 DOSBox Team, published under GNU GPL.
---
CONFIG:Loading primary settings from config file dosboxTex4.conf
CONFIG:Loading additional settings from config file dosboxTex4_single.conf
MIXER:Got different values from SDL: freq 22050, blocksize 1024
ALSA:Can't subscribe to MIDI port (65:0) nor (17:0)
MIDI:Opened device:none
./dosbox/dosbox: line 14: 17649 Segmentation fault "${CURRENT_DIR}/dosbox_x86_64" "$@"
Done.

The seg fault is where it's crashing, the MIDI warning message isn't a show stopper I don't think.

Game version: 2.1.0.7

Did you ever get the problem sorted?

I'm getting a very similar result. The number before "Segmentation fault" seems to be different every time I run start.sh.

The support guy has asked me for the start log, and now I'm waiting for a solution.

I got a solution from GOG support that worked.

This was their answer, and below that is what I did to get the original aspect ratio:

------------------
It looks like you've encountered issue with running the game under the version of DOSBox that is prepackaged. Let's try to troubleshoot it:
1) Please install install 32bit DOSBox to make sure all dependencies are satisfied, for example using this command:
sudo apt-get install dosbox:i386

Then, you should alter the script "dosbox" in "dosbox" folder, so 32 bit DOSBox will be used to run the game:

line 10:
export LD_LIBRARY_PATH="${CURRENT_DIR}/libs/x86_64"

change it to:
export LD_LIBRARY_PATH="${CURRENT_DIR}/libs/i686"

and the line 12:
"${CURRENT_DIR}/dosbox_x86_64" "$@"

change it to:
"${CURRENT_DIR}/dosbox_i686" "$@"

Then you should be able to run "start.sh" script in the game folder to start the game.

2) If above will not work, then please do not undo it. Instead please open game's DOSBox conf using a text editor. Here find and change these lines, and modify them to these values:
fullscreen=false
fulldouble=false
fullresolution=original
windowresolution=1600x900
output=OpenGL

frameskip=0
aspect=false
scaler=none
-------------------

What I didn't like was that the 4:3 video was stretched to fill my 16:9 screen. I fixed it by changing the following in DosboxTex4.conf:

fullresolution=original changed to fullresolution=1920x1080 (monitor native resolution),

and adding:
aspect=true