/lib/libc.so.6 error with DELTARAY card

Dear colleagues,

I am in search of help with an vague problem we are suffering with
fluka/2011.2.16.

The error we are running into with the attached inputfile is
documented in the log-file of the run as:

Program received signal 8 (SIGFPE): Floating-point exception.

Backtrace for this error:
    + /lib/libc.so.6(+0x33af0) [0x7f0f67a37af0]
    + function mxsgdl_ (0xBDC8A2)
      at line 61 of file mxsgdl.f
    + function sigtab_ (0xA5F9C9)
      at line 1591 of file sigtab.f
    + function fuflin_ (0x8DB45B)
      at line 76 of file fuflin.f
    + function flinit_ (0x8DAD5F)
      at line 187 of file flinit.f
    + function flukam_ (0x803F7F)
      at line 3082 of file flukam.f
    + function fluka (0x40B64C)
      at line 289 of file fluka.f
    + /lib/libc.so.6(__libc_start_main+0xfd) [0x7f0f67a22c4d]

This Error occurs if WHAT(1) of the DELTARAY card is switched to "-1."
(eg to switch the production off). By leaving it empty, Fluka runs
just smooth.

Something similar occurs if we set WHAT(1) of DELTARAY again empty,
but disable by commenting then THRESHOL.

Program received signal 8 (SIGFPE): Floating-point exception.

Backtrace for this error:
    + /lib/libc.so.6(+0x33af0) [0x7f3e0dcdeaf0]
    + /lib/libm.so.6(+0xec68) [0x7f3e0e489c68]
    + /lib/libm.so.6(exp+0x12) [0x7f3e0e49fd12]
    + function dedxfl_ (0xBCF795)
      at line 890 of file dedxfl.f
    + function enionf_ (0xA270F9)
      at line 246 of file enionf.f
    + function enion_ (0xA267E6)
      at line 78 of file enion.f
    + function kaskad_ (0x8E745B)
      at line 2327 of file kaskad.f
    + function feeder_ (0x8D84A7)
      at line 257 of file feeder.f
    + function flukam_ (0x80405B)
      at line 3095 of file flukam.f
    + function fluka (0x40B64C)
      at line 289 of file fluka.f
    + /lib/libc.so.6(__libc_start_main+0xfd) [0x7f3e0dcc9c4d]

We tested, to minimize the possibility of problems originating from a
malfunction of the compiler itself two different systems, Ubuntu
10.04.4 (with latest gcc/4.6.3) and Ubuntu 12.04.

For completeness, I attached the outputfile to show how far Fluka
reads the commands of the inputfile.

Any ideas where the problem sits/any solution proposals?

Best regards,

Franz Englbrecht