Member Rara Avis
Go into the Prose forum (or any of them). Look towards the upper right hand corner of your screen for a drop-down box that says something like "Show topics from last X days." Whatever that X is set to is determining how many days worth of posts you're going to see. The idea is that if you're a frequent visitor (as you certainly are), you don't have to see a full list every time.
Open up the drop down box and you'll discover you can change the X to a larger number. And there are your posts!
(If you want to change X on a more permanent basis, you can do it in "Preferences.")