For those who own a Plextor DVD RW drive
Before you start making copy of a Multisession disc using Disc Duplicate or Import Track.
First go to
plextool menu. Select
DRIVE SETTING. From that menu select
(Enable Single Session). Then you should have no problem copy the whole disc or the last track of a multi-session disc.
Be sure you de-select that
enable single session selection after you are finished, otherwise you made have trouble with other copy programs when you try to make a multisession disc. Have fun you all!!

!!
P.S. I also had a older sony external cd/rw and internal cd/rw drive. I had no problem import the last two tracks of the muti-session disc.