Project vs timeline

Hi,

Yes this one again I am afraid!

I have searched the community forums and I am aware this one has been asked on numerous occasions but I am yet to find one with a suitable resolution.  As per the previous requests, the timeline does not match the preview and having checked the forums I am aware that the preview is inaccurate in displaying the correct timings however, I have followed the advice and published my project.  The problem with that is that the timing of the finished article matches neither the timeline or the preview and I cannot work out why.

Specifically, I have set out a series of pictures and lines of text to appear at different times.  In short, they don't.  On each slide, be it a picture or text, the first object appears on cue but then that is it.  The remaining text doesn't appear and if using pictures, the first one appears but where it is supposed to disappear and be replaced by a different picture, nothing.  I am stuck with the original picture.

I have also ensured that the filtering is correct on the time line so the picture I want to disappear is at the button followed by each of the rest in turn but again, no change.

At a complete loss at the moment.

Regards