Jakub, Thanks for the reply. I did an inventory of all the executables and shared libraries in InsightII and 90%+ are fine with linkages to only __errno_location@@GLIBC_2.0. Only three shared libraries... libcblib.so libdecipher_uif.so libpgthread.so and one executable, density, show symbols to errno. Interestingly the shared libs show... U _errno@@GLIBC_2.0 U errno@@GLIBC_2.0 ...whereas the density binary shows... 086f5f1c B errno 086f5f1c V _errno 0805959c W __errno_location The respective linkages are... ldd libcblib.so linux-gate.so.1 => (0x007c0000) libstdc++-libc6.2-2.so.3 => /usr/lib/libstdc++-libc6.2-2.so.3 (0x00c4c000) libm.so.6 => /lib/libm.so.6 (0x0045b000) libc.so.6 => /lib/libc.so.6 (0x00dca000) libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x008fc000) /lib/ld-linux.so.2 (0x007c1000) ldd libdecipher_uif.so linux-gate.so.1 => (0x007c0000) libstdc++-libc6.2-2.so.3 => /usr/lib/libstdc++-libc6.2-2.so.3 (0x003e6000) libm.so.6 => /lib/libm.so.6 (0x00e90000) libc.so.6 => /lib/libc.so.6 (0x005be000) libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00111000) /lib/ld-linux.so.2 (0x007c1000) ldd libpgthread.so /usr/bin/ldd: libpgthread.so: /usr/local/lib/ld-linux.so.2: bad ELF interpreter: No such file or directory Interestingly for all the shared libs other than libpgthread.so, 'file *' shows... ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), not stripped but libpgthread.so shows... ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), for GNU/Linux 2.0.0, not stripped Should I take this to imply that the problem may be actually from the ancient libpgthread.so? Jack