While version 1.1.48 workes without any problems on my ARM NAS device, 1.1.69 doesn't want to start and exists with Alignment error. $ ./btsync Alignment error Here are last few lines of strace if it helps to debug the error: getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0 brk(0) = 0x349000 brk(0x36a000) = 0x36a000 gettimeofday({1376379137, 723324}, NULL) = 0 mkdir("/tmp", 0777) = -1 EEXIST (File exists) mkdir("/tmp/btsync_dumps", 0777) = -