Recode 2 problems

When i use recode to "import the dvd to burn" for final, if i go back to do it again later , recode says there are no files. If i open up the folder under explorer they are there. Something i don't understand or can't work out , even if you name them all as you go, it works the same, there is a lock feature but it does not apppear to work?
Nero 7.10 essentials recode2