Thank you very much for that video @Nicholas_Zein, it helped me see the common factors here. I was able to reproduce this by switching my Windows Language to Portuguese so I think it has to do with the Windows system translation of DevKinsta.
A temporary fix that worked for me was deselecting then reselecting “Utileze o idioma.” It looks like this changes the application language, which fixes the white screen issue at least until DevKinsta is closed/reopened. I’ll have our devs look into this again.
Please let me know if this temporary fix doesn’t work for you.