Home page not coming up in Fully Kiosk

I have several Amazon fire tablets, both 10 inch and 8 inch that were working excellent with Fully Kiosk. Then both of them quit being able to display the home page for HE. All I get is a white screen with the url address of my hub at the top line.
I have two C7 hubs both with software version 2.3.2.141 and both exhibit the same symptoms. If I put in another url such as msn.com it comes up just fine so it is something related to the HE software.....
One more item. I can bring up the hubitat home page on my C7's with Firefox...
Also tested Google Chrome and it brought up home page no problem.
Has anyone thoughts on this?
Thanks.

Browser update on the tablets maybe? I'd start by clearing the browser app cache and see if that makes a difference.

Thanks for the reply.
I have updated the FKB code to the latest version on both Fire tablets. I have updated to the latest beta for Android Webview and even been in conversation with Aleksey from Fully Kiosk but still no joy.
Aleksey thinks it must be an issue with the Webpage from Hubitat as everything works with the Google Chrome.