Just had similar issue except only the Clan tab wasn't loading. It seems my Antivirus was quarantining the files used to access the Clan part so once I added that to the exception list it all worked. Hopefully this helps others who are stuck out there too!
Hi Just found out about Clan battles and I would be keen to join yours. Let me know what stats you need and I can let you know - also any additional info that I need about applying. Thank you :) WABACom