Recently RIM pushed through an upgrade to it's Facebook application. Moving up from 188.8.131.52, version 184.108.40.206 is now available for download at all the normal locations, but this time around a lot of bug fixes were included (Sound familiar?). Fixes include better calendar integration and how the friends list refreshes - that's the basics of it. If you would like a more detailed look at what has been fixed you can review the RIM knowledge base articles as outlined below for more information.
If you are a BlackBerry facebook user, it's suggested you grab this update to ensure that the application runs correctly for you at all times. I would even take the step of reccomending that you remove the current version installed previously and download the latest.