This is weird. This was fixed for v74 core. Svn core still waits for fix due save states. I just tested it and it works. I set nothing special in gui, just standard settings.
[dosbox]
memsize=16
#vmemsize=2
#vmemsizekb=0
machine=svga_s3
[render]
aspect=false
frameskip=2
[cpu]
core=dynamic
cputype=auto
cycles=max 105%
cycleup=500
cycledown=500
[speaker]
pcspeaker=false
pcrate=8000
tandy=off
tandyrate=22050
disney=false
[midi]
mpu401=none
[gus]
gus=false
[sblaster]
sbtype=sb16
mixer=true
oplmode=auto
oplemu=fast
oplrate=16000
[mixer]
nosound=false
prebuffer=15
rate=16000
blocksize=512
[ipx]
ipx=false
[serial]
serial1=disabled
serial2=disabled
serial3=disabled
serial4=disabled
[dos]
xms=true
ems=true
umb=true
[joystick]
joysticktype=none
[autoexec]
mount c: “<games>/dos”
imgmount D: “<games>/dos/Carmag/cd/maxpack.cue” -t iso
c:
cd Carmag
cd CARMA
CARMA.EXE