title problems with convertxtodvd

ive been useing convertxtodvd for some time now. i mostly use it to join 2 avi files and convert to dvd and all is fine. here lately when i do this it creates the entire disc like normal but it isnt letting the 2 titles work together. when watching it will get to the end of the first title and then stop it wont play the second title right after the first like it should. the second title is on the disc i have to manualy search for it to get it to play in my dvd players. is there some sort of setting in convertx to fix this problem?