Ok... some things to do:
please be absolutely sure that you have an up to date subscription. If needed, please check in your account info page
log out, clear cookies and cache, and login from u2.com (NOT from zootopia.u2.com)... once logged, please go to the appropriate section and post something...
if you did all of this and still are unable to open new threads and post, please let us know...
thanks...