I downloaded Beta 7.2.0 and as I tried to select Chroma Key Blur - Manycam just exited. I uninstalled Beta and installed the production version. Still happened. Only when I “reset” all settings was manycam able to do Chroma Key, and even then it crashed a few times.
Now I think it is stable on the production version. I have been using Manycam for quite some time - a few years - prior to the beta crashes with no problem.