Several users have reported seeing Content Security Policy (CSP) violation warnings when presented with the latest LatAM campaign banners listed here. The warnings report that the banners pull resources from external domains (e.g., wmcloud.org, wmflabs.org).
When trying to recreate the problem, I also got CSP warnings in Chrome reporting that the inbuilt Google Translate tool was violating the same rules and includes non-approved domains. This might have been an unhelpful distraction. Examples here