If you use the web developer tools in your browser you can view the size of the window. I did this by resizing the window and found where the breaks occurred that caused the white bar to appear.
I have the same issue on the mobile screen size on the iAmaze theme. Once I size the window to under 1000 pixels in width, a light bar appears between the menu (blue in my case) bar and the iAmaze slider. Here is the site URL: https://comreninc.com/
Thanks,
Sue
Okay, I see that there was a new option now (after the update) when I started to edit the page on my site (it is a one page site), a section called “Page Heading Options” where the choices are Normal Page Title Bar, Default Image/Video Header, I-AMAZE Slider, or None. The default option apparently was for the first “Normal Page Title Bar”. Therefore it was set to the Normal Page Title and not the I-AMAZE Slider. Changing this option to the I-AMAZE Slider indeed brought back the slider. Thank you!