New Posts problem?
 

I am signed in, and when trying "new posts", I am told to log in, and after trying lots of times, there must be a glitch in the system!

It sounds like you have an outdated cookie. This should solve your problem:

1) Click the 'Log Out' link in the upper right navigation, three links to the right of the 'New Posts' link.

2) Log back in.

3) You should now have no problems when clicking the 'New Posts' link. :)