Your debug log shows one domain in your whitelist - ustv247.com. Is this the domain you recently added and that will not load? Is this domain shown in your whitelist on the admin web page, and if so, is it the only domain shown on that list?
Please run this command from the Pi Linux terminal to show the contents of your whitelist file on the SD card and paste the results:
cat /etc/pihole/whitelist.txt
Please run this command to see how Pi-Hole processes this domain and paste the results:
pc1) win10 with firefox, edge, chrome. Pihole Whitelisting does not work
pc2) linux mint 19 with firefox. Pihole whitelisting does not work
pc3) win7 with firefox, chromoe, and IE. Pihole whitlisting does not work.