Oracle Form Builder (12.2.1.4.0) crashes opening the <Layout Editor>
I have converted a Form developed with the Forms [32 Bit] Version 6.0.8.25.2 (Production) Form Builder to the Forms [64 Bit] Version 12.2.1.4.0 (Production) Form Builder. The Forms Migration Assistant have supported med in converting the fmb file.
Our development environment is in the Microsoft Windows environment (Windows server 2019 Standard) and the fmb file (form) consist of three canvases. Opening these canvases in the <Layout Editor> works fine to two of them, but opening the third canvas just makes the Form Builder disappear without any error messages or warnings. Just vanishes.
Does anyone have any tip on what is wrong?