I have recently uploaded Pi Presents version 1.3.1h to Github.
A few people have reported intermittent problems with playing video with the new dbus interface to omxplayer introduced in 1.3.1g. This version hopefully fixes those problems. In addition to fixes to Pi Presents I found it necessary to increase the GPU Memory from the default 64 MB to 128 Mb if playing videos. Instructions on how to do this are in the Release Notes.
Now that Wheezy is unsupported I have removed the requirement to use sudo when using GPIO (actually its use is inhibited). There are also a couple of other minor bug fixes.