Archives pages:
Sounds as if the permission on the directory isn't set properly. If the Web server can't write to that directory (default: story), then nothing will show up in it.

Also, make sure that the system date is being displayed properly in the console. If its not being able to get the right date, it could lead to other problems.

Logging on:
Same problem. The program isn't able to write to the ojauth directory it needs to (default: found in the cgi-bin directory). You need to ensure the Web server can write to this directory or move it to a place it can write to it.