My Revel library shows all pictures on the base computer. All dates show up on my iphone when logging in. Many of the latest dates are missing on the ipads invited as well as many of the macs that are invited.
Sorry you have run into some problems.
A few questions before I make some suggestions.
On your "base computer" where you see all your images. There is a colored dot next to the library name you are viewing (We call that the status indicator). What color is it? If you tap the status indicator you will be taken into what we call the status view. Do you see any images in that view waiting to be uploaded? Or do you instead see the message "Everything is up to date?"
How much free space is available on the devices where you are not seeing all your images?