Is it just me?

First off, I love Jamplay. This app however does not seem to be working properly for me. Ive scoured reviews for similar problems that Im experiencing to no avail. Im on an iPhone 5c and NONE of the videos will play. Also most of the jam tracks will not play. I have uninstalled and reinstalled. Do I need to update my operating system or what (havent updated to ios8 yet)? Help please!

labt3k about Guitar Lessons by JamPlay, v1.34