Opera Beta 50.0.2401.134509 (1905002209)
Verixon Ellipsis 10 tablet
Whitelisting sites for ad blocking doesn't seem to work. . In some cases, the placeholder appears, but not the ad. And whatever mechanism the site uses to check for ad blocker still says the blocker is active.
I've tried entering the site directly to the whitelist, as well as adding through long touch on the URL icon. I've also tried closing and reopening Opera beta.