Multisession CDs

Hi I have been using Nero for some time, but I rarely use multisession. Lately I have started burning my photos on CD and have been doing multisession. But when using Nero Express sometimes I find that the cd will only show the files I burned in the latest session and all the previous ones have disappeared! I tries doing it using Nero Buring Rom and when I came to choosing the track I tried choosing various tracks, and it has happened as well. I tried help but I didn’t find it very helpful. It must be something stupid because nobody seems to have this problem.

Can someone help please? Thanks.