Model Builder grey out on reopening the program

Question

Hi everyone, I'm an arcGIS pro newbie, I made this model which is pretty easy and when I saved and reopened the program, upon first opening the program it looks all coloured, but upon validating/running the model immediately all greys out and I cannot even double click and rerun the processes.

This happens with another project as well so I cannot close them because I will then have to rebuild the model from scratch.

I get the error : "None of the processes are ready to run".

Any ideas? I would really appreciate your help.

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Rick_O_Hara · Answer

I'd also like to know why it's so unreliable.

zhuzhu · Answer

I've encountered something similar. Which version of Pro and which toolbox type were you using? I've found issues with the new .atbx with Pro 2.9. Once I switched to .tbx, that issue went away. The model will validate after the project reopens.