Default page & can't add my old addons domains

[platfor4]

Hey all!
As many of you, I'm getting the "Default Page" too, I've been flushing my DNS for 10 times now, nothing has changed. My domain is airlineslounge.tk ...
But I'm not sure that this is the problem because my "subdomain" platform.x10.mx works fine.
In fact, I "loss" my addon domain while the migration and I can't recover it. The system is saying "Sorry, cannot determine nameserver IPs. Please make sure that the domain is registered with a valid domain registrar." But I haven't change anything for more than a month...

Thanks for your help!

 

[ucmsdevx]

aleted leafypiggy about this

 

[platfor4]

Maybe it will help you to understand my problem...
http://dnscheck.pingdom.com/?domain=airlineslounge.tk&timestamp=1398867781&view=1

And then;