[moved]

What dosbox version (before and after)? And what OSs?
Using the same dosbox.conf and directory layout for the app?

I tried 0.65 and 0.72
Win XP SP2

I'm using the following conf (Scor4 is the directory of the application Score. Dosbox in C:\Tools\DOSBox)

[sdl]
# fullscreen -- Start dosbox directly in fullscreen.
# fulldouble -- Use double buffering in fullscreen.
# fullfixed -- Don't resize the screen when in fullscreen.
# fullwidth/height -- What resolution to use for fullscreen, use together with fullfixed.
# output -- What to use for output: surface,overlay,opengl,openglnb.
# hwscale -- Extra scaling of window if the output device supports hardware scaling.
# 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.

fullscreen=false
fulldouble=false
fullfixed=false
fullwidth=0
fullheight=0
output=surface
hwscale=1.00
autolock=true
sensitivity=100
waitonerror=true

[dosbox]
# language -- Select another language file.
# memsize -- Amount of memory dosbox has in megabytes.
# machine -- The type of machine tries to emulate:auto,hercules,cga,tandy,vga.
# Try a specific type if your game has problems with auto.

language=deutsch.lng
machine=auto
memsize=64

[render]
# frameskip -- How many frames dosbox skips before drawing one.
# snapdir -- Directory where screenshots get saved.
# aspect -- Do aspect correction.
# scaler -- Scaler used to enlarge/enhance low resolution modes.
# Supported are none,normal2x,advmame2x

frameskip=0
snapdir=snaps
aspect=false
scaler=normal2x

[cpu]
# core -- CPU Core used in emulation: normal,full,dynamic.
# cycles -- Amount of instructions dosbox tries to emulate each millisecond.
# Setting this higher than your machine can handle is bad!
# cycleup -- Amount of cycles to increase/decrease with keycombo.
# cycledown Setting it lower than 100 will be a percentage.

core=dynamic
cycles=3000
cycleup=500
cycledown=20

[bios]
# Nothing to setup yet!

[dos]
# xms -- Enable XMS support.
# ems -- Enable EMS support.

xms=true
ems=true

[sdl]
fulldouble=false
fullfixed=false
fullwidth=0
fullheigth=0
output=surface

[render]
aspect=false
scaler=none

[autoexec]
# Lines in this section will be run at startup.
Mount C C:\Scor4
c:\keyb gr

bat:
dosbox C:\scor4\scor4.exe -c "MOUNT D C:\Temp" -fullscreen -conf score_neu.conf -c set DOS=HIGH,UMB -exit

This conf is quite old, maybe create a new one.

ok, I create a new conf, based on the original 0.72 config. The result is the same. "Dyncore ...."

Be sure you don't re-add stuff like keyb.com while testing.

With the clean dosbox.conf, choose some mounting and stick to that
(like mount c c:\oldstuff) and re-install the app.