I'm trying to set up a game called The Last Express. It works just fine in windowed mode; however, in fullscreen, the color palette is all wonky. I have tried changing settings, starting in fullscreen mode, etc., but to no avail.

I use OS X with DosBox 0.70

A screenshot of the problem is attached, and the following is my configuration file:

[sdl]
# fullscreen -- Start dosbox directly in fullscreen.
# fulldouble -- Use double buffering in fullscreen.
# fullresolution -- What resolution to use for fullscreen: original or fixed size (e.g. 1024x768).
# windowresolution -- Scale the window to this size IF the output device supports hardware scaling.
# output -- What to use for output: surface,overlay.
# autolock -- Mouse will automatically lock, if you click on the screen.
# sensitiviy -- Mouse sensitivity.
# waitonerror -- Wait before closing the console if dosbox has an error.
# priority -- Priority levels for dosbox: lowest,lower,normal,higher,highest.
# Second entry behind the comma is for when dosbox is not focused/minimized.
# mapperfile -- File used to load/save the key/event mappings from.
# usescancodes -- Avoid usage of symkeys, might not work on all operating systems.
fullscreen=false
fulldouble=true
fullresolution=desktop
#fullresolution=original
windowresolution=original
output=opengl
# output=surface
autolock=false
sensitivity=100
# waitonerror=true
priority=higher,normal
# mapperfile=mapper.txt
# usescancodes=true

[dosbox]
# language -- Select another language file.
# memsize -- Amount of memory dosbox has in megabytes.
# machine -- The type of machine tries to emulate:hercules,cga,tandy,pcjr,vga.
# captures -- Directory where things like wave,midi,screenshot get captured.
language=
machine=vga
# captures=/Users/rhoenie/Desktop/Captures
memsize=64

[render]
# frameskip -- How many frames dosbox skips before drawing one.
# aspect -- Do aspect correction, if your output method doesn't support scaling this can slow things down!.
# scaler -- Scaler used to enlarge/enhance low resolution modes.
# Supported are none,normal2x,normal3x,advmame2x,advmame3x,advinterp2x,advinterp3x,tv2x,tv3x,rgb2x,rgb3x,scan2x,scan3x.
frameskip=0
# aspect=true
aspect=false
# scaler=none
scaler=normal3x

[cpu]
# core -- CPU Core used in emulation: simple,normal,full,dynamic.
# cycles -- Amount of instructions dosbox tries to emulate each millisecond.
# Setting this higher than your machine can handle is bad!
# You can also let DOSBox guess the correct value by setting it to auto.
# Please note that this guessing feature is still experimental.
# cycleup -- Amount of cycles to increase/decrease with keycombo.
# cycledown Setting it lower than 100 will be a percentage.
core=dynamic
cycles=auto
# cycles=6500
cycleup=500
cycledown=20

[mixer]
# nosound -- Enable silent mode, sound is still emulated though.
# rate -- Mixer sample rate, setting any devices higher than this will
# probably lower their sound quality.
# blocksize -- Mixer block size, larger blocks might help sound stuttering
# but sound will also be more lagged.
# prebuffer -- How many milliseconds of data to keep on top of the blocksize.
nosound=false
rate=22050
blocksize=2048
prebuffer=10

[midi]
# mpu401 -- Type of MPU-401 to emulate: none, uart or intelligent.
# device -- Device that will receive the MIDI data from MPU-401.
# This can be default,alsa,oss,win32,coreaudio,none.
# config -- Special configuration options for the device. In Windows put
# the id of the device you want to use. See README for details.
mpu401=intelligent
# mpu401=none
device=default
# device=coreaudio
config=

[sblaster]
# sbtype -- Type of sblaster to emulate:none,sb1,sb2,sbpro1,sbpro2,sb16.
# sbbase,irq,dma,hdma -- The IO/IRQ/DMA/High DMA address of the soundblaster.
# mixer -- Allow the soundblaster mixer to modify the dosbox mixer.
# oplmode -- Type of OPL emulation: auto,cms,opl2,dualopl2,opl3.
# On auto the mode is determined by sblaster type.
# All OPL modes are 'Adlib', except for CMS.
# oplrate -- Sample rate of OPL music emulation.
sbtype=sb16
sbbase=220
irq=7
dma=1
hdma=5
mixer=true
oplmode=auto
oplrate=22050

[gus]
# gus -- Enable the Gravis Ultrasound emulation.
# gusbase,irq1,irq2,dma1,dma2 -- The IO/IRQ/DMA addresses of the
# Gravis Ultrasound. (Same IRQ's and DMA's are OK.)
# gusrate -- Sample rate of Ultrasound emulation.
# ultradir -- Path to Ultrasound directory. In this directory
# there should be a MIDI directory that contains
# the patch files for GUS playback. Patch sets used
# with Timidity should work fine.
gus=false
gusrate=22050
gusbase=240
irq1=5
irq2=5
dma1=3
dma2=3

[speaker]
# pcspeaker -- Enable PC-Speaker emulation.
# pcrate -- Sample rate of the PC-Speaker sound generation.
# tandy -- Enable Tandy Sound System emulation (off,on,auto).
# For auto Tandysound emulation is present only if machine is set to tandy.
# tandyrate -- Sample rate of the Tandy 3-Voice generation.
# disney -- Enable Disney Sound Source emulation.
pcspeaker=true
pcrate=22050
tandy=auto
tandyrate=22050
disney=true

[bios]
# joysticktype -- Type of joystick to emulate: none, 2axis, 4axis,
# fcs (Thrustmaster) ,ch (CH Flightstick).
# none disables joystick emulation.
# 2axis is the default and supports two joysticks.
joysticktype=2axis

[serial]
# serial1-4 -- set type of device connected to com port.
# Can be disabled, dummy, modem, directserial.
# Additional parameters must be in the same line in the form of
# parameter:value. Parameters for all types are irq, startbps, bytesize,
# stopbits, parity (all optional).
# for directserial: realport (required).
# for modem: listenport (optional).
# Example: serial1=modem listenport:5000
# serial1=modem listenport:45000
serial1=dummy
serial2=dummy
serial3=disabled
serial4=disabled

[printer]
# printer -- Enable printer emulation.\n"
# dpi -- Resolution of printer (default 360).
# width -- Width of paper in 1/10 inch (default 85 = 8.5'').
# height -- Height of paper in 1/10 inch (default 110 = 11.0'').
# output -- Output method for finished pages:
# png : Creates PNG images in the DOSBOX directory
# ps : Creates Postscript documents in the DOSBOX directory (default)
# bmp : Creates BMP images (very huge files, not recommend)\n"
# printer : Send to an actual printer (Print dialog will appear)
# multipage -- Adds all pages to one Postscript file or printer job until
# ALT-F8 is pressed.
printer=false
# dpi=300
# DIN A4 = 8.3 ◊ 11.7 inches
# width=83
# height=117
# output=ps

[dos]
# xms -- Enable XMS support.
# ems -- Enable EMS support.
# umb -- Enable UMB support (false,true,max).
xms=true
ems=false
umb=true

[ipx]
# ipx -- Enable ipx over UDP/IP emulation.
ipx=true

# I use this to mount all stuff needed for the game Dark Forces
# at startup.
#
[autoexec]
MOUNT C ~/Documents/LastExpress/TLXC
MOUNT D ~/Documents/LastExpress/EXPRESS -t cdrom -l EXPRESS
C:
cd EXPRESS
EXPRESS