We have updated our build on the download center to resolve a couple of issues related to the screen capture application. Some machines with Expresion Encoder 4 Pro were incorrectly limiting the screen capture time limit and we had an issue with XESC files being played back in the Windows Media Player on 64-bit Vista and Windows Server 2008.
In order to upgrade, simply grab the newest version of the free Encoder (available here) and install over the current one. The version number will go from 4.0.1639.0 to 4.0.1651.0. Note that there is no need to uninstall the older version, setup will upgrade it for you. Please also take note that those international versions already have the fixes mentioned above, so there is no need to upgrade them.