dstke Thank goodness I'm not the only one having this problem. I recently am travelling and tried to connect to WiFi at multiple airport and airport lounges in North America since yesterday and I've been getting the same error at 3 of 4 of the captive portals. 2 of them were at lounges of the sane airline. 1 I think connected without trouble, and for the last I simply reloaded the captive portal page by pulling down from the top of the page and the captive portal page loaded and let me through. When I tried the reloading trick at both airline lounges (with same captive portal), it would actually load the captive portal page, I'd accept the agreement, but then I'd be sent back to the same error page. I also tried changing multiple privacy settings in Vanadium with no luck.
Note that none if the WiFi portals required user/pass, just accepting terms.