Firstly, I must apologise for the long absence, but health issues ( a curse of ageing) have been a bit of a problem. Back to the problem. I have tried the suggestions, but realise I didn't explain things very well. On my PC, in a file under "My Documents" I have a folder " Personal Video Database" In this folder I have some 430 entries with a file type of .pvd. If I open (startup PVD, I get a listing of some 250 movies, not 430. If I pick a title that I know I have, but is not displayed, & double click on the entry in the PC, it causes a new opening of PVD with the "missing" entry displayed. It doesn't stay with the same file, but appears to be random. I have reinstalled PVD with no improvement. I have tried it on 2 different PCs. I am running Windows 7 Ultimate, i5 680 CPU, 4gb memory.