MODX has been updated to version 2.4.2, which contains mostly bug fixes. 2.4.0 was a major recent release, and we highly recommend upgrading if you haven't yet. There are many bug fixes and performance improvements.
One particular improvement of note is an updated Media Manager. You now have the ability to view items in List View instead of just thumbnails, which never made much sense when viewing a list of PDFs! To switch to list view, when you're in the Media Manager just change the View popup at the top from Grid to List. The default view can be set in the MODX system settings, so if you'd prefer for List view to be the default, just let us know and we'll change that setting for you.
One other small update is that the MODX version number will now appear in the upper left instead of the search box, so you'll be able to know at a glance what version your site is running. Clicking the magnifying glass to the right of your site name in the upper left will open that search box, and you can immediately type into it.
We make it a habit to update the sites of all our clients whenever we happen to be doing some work on them. If you notice that you haven't been updated in a while, shoot us an email and we'll get right to it.