Hi Mike,Thanks for the info. Here's what I got:[code:1:6fb86baa3e]% gdb /iraf/iraf/bin.macosx/x_images.e
GNU gdb 6.3.50-20050815 (Apple version gdb-1705) (Fri Jul 1 10:50:06 UTC 2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared libraries .. done(gdb) run imcombine @dpar
Starting program: /iraf/iraf/bin.macosx/x_images.e imcombine @dpar
Reading symbols for shared libraries +........................ doneSep 10 20:50: IMCOMBINE
combine = average, scale = none, zero = none, weight = none
blank = 0.Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0xfffffffc
0x0021f073 in iclog_ ()
(gdb) where
#0 0x0021f073 in iclog_ ()
#1 0x002291a5 in icscae_ ()
#2 0x001ee3a8 in iccomr_ ()
#3 0x001ee167 in icombr_ ()
#4 0x00225a35 in icombe_ ()
#5 0x000b6f6d in timcoe_ ()
#6 0x00002237 in sysruk_ ()
#7 0x0043323e in irafmn_ ()
#8 0x002dffcc in main ()
(gdb)
[/code:1:6fb86baa3e]I can reproduce the error on Mac OSX 10.6.8.I can also reproduce the error using IRAF v2.16 on Mac OSX 10.6.8:[code:1:6fb86baa3e]ecl> print (cl.version)
IRAF V2.16 March 2012
[/code:1:6fb86baa3e][code:1:6fb86baa3e] % gdb /iraf/iraf/bin.macosx/x_images.e
GNU gdb 6.3.50-20050815 (Apple version gdb-1515) (Sat Jan 15 08:33:48 UTC 2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared libraries .. done(gdb) run imcombine @dpar
Starting program: /iraf/iraf/bin.macosx/x_images.e imcombine @dpar
Reading symbols for shared libraries +. doneSep 10 20:18: IMCOMBINE
combine = average, scale = none, zero = none, weight = none
blank = 0.Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0xfffffffc
0x0021d363 in iclog_ ()
(gdb) where
#0 0x0021d363 in iclog_ ()
#1 0x0022734e in icscae_ ()
#2 0x001ed995 in iccomr_ ()
#3 0x001ed76c in icombr_ ()
#4 0x00223c11 in icombe_ ()
#5 0x000b916b in timcoe_ ()
#6 0x00002961 in sysruk_ ()
#7 0x004437dd in irafmn_ ()
#8 0x002de3f1 in main ()
(gdb)
[/code:1:6fb86baa3e]Many thanks,Emma