Just one more data point. Running under valgrind I get the following errors: ==8773== Memcheck, a.k.a. Valgrind, a memory error detector for x86-linux. ==8773== Copyright (C) 2002-2003, and GNU GPL'd, by Julian Seward. ==8773== Using valgrind-20030725, a program supervision framework for x86-linux. ==8773== Copyright (C) 2000-2003, and GNU GPL'd, by Julian Seward. ==8773== Estimated CPU clock rate is 697 MHz ==8773== For more details, rerun with: -v ==8773== ==8773== Source and destination overlap in strcpy(0x8311830, 0x8311833) ==8773== at 0x400216BF: strcpy (mac_replace_strmem.c:87) ==8773== by 0x82A2B45: time_str (in /home/droundy/darcs/darcs) ==8773== by 0x40330E3D: __libc_start_main (in /lib/libc-2.3.2.so) ==8773== by 0x8049F50: (within /home/droundy/darcs/darcs) ==8773== ==8773== Invalid read of size 2 ==8773== at 0x829E3E6: heapCensusChain (in /home/droundy/darcs/darcs) ==8773== Address 0xFFFFFFFC is not stack'd, malloc'd or free'd Segmentation fault I don't know if the overlapping source and destinations in strcpy are the problem or not. The address 0xFFFFFFFC is also being accessed when I run on MacOS X. -- David Roundy http://www.abridgegame.org