Well, another correspondent has had more success. Here is the note from the USCCB received in response to a query about the time limits on Psalms:
Keeping multiple months online simultaneously would make things confusing to find and overwhelm server capacity.
You are free to make of that what you will, but it seems like an upgrade is in order. After all, NLM is able to store 3 years of massive data and do it on free servers. In fact, I'm sure that the USCCB could talk to Shawn Tribe about hosting Psalms, and the CMAA would certainly be happy to host all Psalms on its server. Anything to help out.