I upgraded quform to version 2.3.0 today. After the update, my site will not display. If I deactivate all plugins, the site will display correctly. If I activate only quform, the site will not display.
I forgot to try changing my theme to 2017. With the 2017 theme, there is no problem, so it appears it is a conflict with my theme, Fiji 2, by Flo Themes.