i cannot seek some of the mp3 files.....i cannot do fast forward or back ward....

when some mp3 files are playing i cannot go fast forward using scroll button or aniway...its just playing dats all.....i cannot seek to another position.....

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: libgstreamer0.10-0 0.10.32-3ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Sat May 14 15:13:29 2011
ExecutablePath: /usr/bin/totem
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gstreamer0.10
UpgradeStatus: No upgrade log present (probably fresh install)
XsessionErrors:
 (<unknown>:1338): dee-WARNING **: Transaction from com.canonical.Unity.ApplicationsPlace.RunnerGroupsModel is in the past. Ignoring transaction.
 (nautilus:1351): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed