Check that your SESSION_DIR entry in ~root/.oprofile/daemonrc is set to the default:
 
$ cat ~root/.oprofile/daemonrc
SESSION_DIR=/var/lib/oprofile
NR_CHOSEN=0
SEPARATE_LIB=0
SEPARATE_KERNEL=0
SEPARATE_THREAD=0
SEPARATE_CPU=0
VMLINUX=/boot/vmlinux-dbg-2.6.20-16-generic
IMAGE_FILTER=
CPU_BUF_SIZE=0
CALLGRAPH=8
KERNEL_RANGE=c01000a0,c029f508
XENIMAGE=none



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