Hi IDL tech support:

We are having trouble using some GUI-driven IDL
applications under Linux Fedora core 7. At least 
one of the apps seg faults at unpredictable places.

All works fine under fc5, under which the apps were
developed. We are running IDL 6.4 under both OS's: 

IDL Version 6.4 (linux x86 m32). (c) 2007, ITT Visual Information Solutions
Installation number: 95183-400.
Licensed for use by: HAO:hao.MU

The seg faulting occurs only when sitting at the
fc7 display. If you are at the fc7 console and ssh
to an fc5 system, it fails. If you are at the fc5
console, then the apps work fine, even if you ssh 
to an fc7 system.

Here are uname -a for sample systems on each OS:

Linux sofie 2.6.23.8-34.fc7 #1 SMP Thu Nov 22 23:05:33 EST 2007 i686 i686 i386 GNU/Linux

Linux oreo 2.6.20-1.2320.fc5smp #1 SMP Tue Jun 12 19:40:16 EDT 2007 i686 i686 i386 GNU/Linux

The results of help,/device are basically the same
at both fc5 and fc7:

IDL> help,/device
Available Graphics Devices: CGM HP LJ NULL PCL PRINTER PS REGIS TEK X Z
Current graphics device: X
    Server: X11.0, Hummingbird Ltd., Release 8000
    Display Depth, Size: 24 bits, (1280,1024)
    Visual Class: TrueColor (4)
    Bits Per RGB: 8 (8/8/8)
    Physical Color Map Entries (Emulated / Actual): 256 / 256
    Colormap: Private, 16777216 colors.  Translation table: Enabled
    Graphics pixels: Decomposed,        Dither Method: Ordered
    Write Mask: 16777215 (decimal) ffffff (hex)
    Graphics Function: 3 (copy)
    Current Font: <default>,    Current TrueType Font: <default>
    Default Backing Store: Req from Server.

I have tried making a simple procedure to duplicate the
error, but it succeeds under both fedora versions. I'm attaching
a tar file of one of the apps -- this one seg faults after reading
a 242 MB netcdf file, available at

http://download.hao.ucar.edu/pub/foster/ittvis

Thanks for any suggestions on this..

--Ben