Fusion Nodes turning red and not updating

I am new to fusion so I have no idea if this is normal thing and I am missing something or if this is a bug.

I am using the latest Davinici Resolve 16 beta 4 for Mac. I am using macOS Mojave Version 10.14.5 on a Mac Pro (Late 2013).

I built a simple animation yesterday and everything worked great. Today when I open the project back up some of the nodes names turned red and it leaves a black box where the graphics should be. Basically I have 3 png files that are social media icon squares and they rotate along the y axis and cut to the next logo during the spin.
If I disconnect some of the media inputs from the 3dmerge, the red nodes turn back to white text and I can see the animations. I have checked to make sure my media is still connected. I even reloaded the media clips. but after connecting all three media inputs, it turns red again.

I am attaching an image of what I am describing.

I think I answered my own question. I tried all kinds of things with the nodes and nothing was working. What I learned was that all the layers in the keyframes window need to be the same length starting at frame 0 and all ending at the same time instead of some of those layers ending early. Once I made all the layers the same length all the nodes turned white and everything is perfect again.

I’m having the same problem and the way you described the solution is kinda confusing. Mind elaborating?

all the layers in the keyframes window need to be the same length starting at frame 0 and all ending at the same time instead of some of those layers ending early. Once I made all the layers the same length all the nodes turned white and everything is perfect again.

Thank you! I was being driven nuts by the same issue. Console showed me that something was wrong with one of the nodes but I didn't find it until I read of your helpful experience! Thanks!!

Well, the node only gets an input, as long as the clip exists in the timeline at this specific frame. If your clip starts later or has already ended, there is no input for your node.
That's it. Simple and absolutely logical.

Yes, it's something that comes up all the time with Fusion. Unlike the main timeline of other programs like after effects, the flow only begins with an image that you give it. So if an image start frame isn't until frame 10, then the image plane has nothing to pull until then and errors.

You can fix this by adding a transparent BG under your logo that starts at frame 0.