I rooted my HTC One last night and currently have CM11 on it.
Everything worked well while i was on WIFI. I managed to update apps, sync email accounts etc.
However when I'm not at home and on mobile data, some apps don't work. eg, Facebook, Instagram. Google Chrome won't download files either.
When I arrive in school and back on its WIFI, such apps work as per normal again. It seems like there's a problem when I'm on mobile data.
If it helps, I'm on CM11 and CWM 220.127.116.11.
Thanks in advanced.
EDIT: Managed to resolve the problem. Thread can be closed. Apologies.