i am able to login to cpanel ok and access cpanel
with firefox 52.9 esr using
https://x10hosting.com/sso/login
i can also access my ftp just fine.
im not seeing any errors on my end.
Maybe be sure your cookies and temp files are deleted,
dont use any ad blocking add-on's, maybe try a different browser.
if you still cannot access the cpanel you can try x10 hosting's
https://x10hosting.com/contact-us section to report your problem.
as you may get better results for those issues since the forum support
is mostly based on volunteer help and dont have access
to fix any server issues.