the calculated gravity and gravity error curves are missing

Hi all,

I was working on a forward model via GM-SYS and suddenly the curves for the calculated gravity and gravity error disappeared, although in the display they are selected. Does anyone know what is the problem with this? how can I fix it?
So far, I tried the following approaches, none of them worked:
1- save the model in a new file and open it in a new project. 
2- close the program and restart 
3- check all the tabs and windows and bars
4- uninstall and reinstall the software. 

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