elements not visible in preview while visible in timeline player and adding just images broke navigation :-(

I added a image to the base layer and previewed and saw the image.

I also added a video to the base layer in place of the image and can see that working fine.

If i remove visibility on the video on the base layer, you can't see the image i started with before adding the video even if it's at the top of the timeline i can't see the image.  where did it go?

for the 2nd layer Tab 01 i have an image picked out and is visible on the layer preview.  So is the text sitting on top of the image.  i added a shape and made it semi transparent so the image is muted and it's easier to read the text.  I can't see this rectangle i named white mask show up in preview.  All i see is the photo and the body text.  no white rectangle.  I even tried turning off the transparency and made it solid white so you can't see the image at all and you still can't see the white mask rectangle at all.  it's solid white and covers the image but in preview all i see is the image with text on top.  no mask triangle shows up.

so I can't see an image i'm no longer using on the base layer and can't see the white mask i put to cover the image at all and both are present in the timeline.  If I play the timeline from the editor interface I can see the white mask cover come in fine as the player moves across the timeline.  I however don't see this at all in preview the slide and don't know why.

now my navigation to other tabs is broken.  I'm not sure how long they should be on the timeline.  Originally it was set to 1 second timeline per layer but now that i've modified layer tab 01 the shortest time i can make it is 5 seconds.  Also I noticed the player slide bar stop 20% of the way through the slide it just stops and i don't know why.

Why after I click on unwanted behavior (Tab 01) I see Tab layer 01 fine.  then click on the next bar over which is "Of a Sexual Nature" and I then see the white mask I put over the image on Tab 01 show up, then after 2 seconds I'm on layer 2 (tab 02) and how did I get there?

All I've done is drop a video on the base layer and picked out some images for each layer/tabs and dropped an image in the center of the layer.  Not sure how i'm going to use the images side by side with text.  overlay.  have not decided yet 

Adding just images and a video on the base layer has broken the navigation.  I don't know why :-(

See attached and please advise 

Thanks