I have been putting together PTE presentations on my PC without problem. However when I run them on my laptop (newer and higher spec than PC) the transitions (i.e. cross fades) seem to work fine in the early part of the presentation but occaionally the transition jumps to the previous picture rather than the next. This can either just happen on a single occasion or can repeat itself jumping back and forward between the same two pictures. Music and commentary continue as normal but presentation is then out of synch. Has anyone else encontered this problem and if so can you offer any help to a solution. Laptop spec. Advent 7027, Processor P4 3Ghz, Memory 1Gb, Display Mobility Raedon 9000.