Thank you for the prompt reply.
Interesting that only these image URL's seem to be blocked, as we load hundreds of images off that server that seem to be unaffected.
The games are loaded from the videopoker.com domain, however if you visit the image URL's above directly, the following appears:
Website blocked due to a suspicious download
Download blocked: https://media.vidpok.com/games/WheelDeluxe17/images/animations/111.png
If you need to load the game, which is indeed free, you can visit the following address: https://www.videopoker.com/play/?game=127&mbtest=1&title=Ultimate X Spin Poker
You will see that it loads to about 98% before presenting an error. The console allowed me to see the images that were being denied. Turning off "scams" blocking in Browser Guard allows them to load.