Everytime i go to another screen, 
, all the variables blocks (except for initializations) are marked with a red cross : 
A click on any block instantly makes them disappear.
I’m using firefox.
Use firefox, go to the block view, change screen (go to a screen with variables), and they are all marked as error. Just click on any block to make them disappear.
Does this happen in other browsers?
Can you check if this happens in App Inventor?
Does it only happen on one project or all of them?
Yes I also have this bug in variables I am using Chrome
I just tested this and couldn’t seem to reproduce it. Could you provide the specific steps you are taking for it to happen?
I closed the project to re-open it in chrome, but now i can’t reproduce it anywhere !
Maybe it was just a loading error which appeared once 
Let us know if it happens again
I had the same issue. It was when I deleted a component, I had 689 errors. I went WTF!!! I took a checkpoint snapshot, and reloaded and it was fine.
There is a bug, it is wierd however it is not fatal
This happens to me if i imported a bit old .aia with variables in it. like this one.
scratchcard.aia (252.0 KB)
I last encountered this error today when dragging a new block onto the blocks area.
