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I didnt find the reason for this out, it seems ctptalk, leofinance etc work, but those 2 dont.

Yeah, it looks like now the front-ends are going to compete ... I don't like that ... btw: wasn't there another site on Hive for content search/discovery?

I am not sure if they will compete or not.

btw: wasn't there another site on Hive for content search/discovery?

do you mean ListNerds?

No, something else, but I can't find it on Hive projects, you just surf on hive pages (from all front-ends) and you liked the content or not. Can't remember the site :(
Just remember that when I tested it, it doesn't show Ecency pages and I complain and they, later add all main front-ends...

ahh yes veews.io is the one you mean

Yeah, that's it.

Im not really using it as I have ecency though. Perhaps for newbies it is a good tool.

It has to do with how some site handle/allow frames.

CTPX displays its XPLORE sites with a frame, and places like Ecency and Peakd do not allow this, so they fail the checker.

All Hive Outpost sites seem to work though.

Well, veews.io is also content discovery site and it has frames also but all front-ends works well there...

I presume veews and ctpx are coded differently!

Yeah, probably. But that's not the reason to change this. Except if they do not want to change.