bug in player?

i´m running the istopmotion app version 1.5 in IPAD3, with IOS6.
My problem is that the player, in the program, jumps around among the pictures while just playing the movie. It flickers and its very annoying. How do i get it to stop? what´s up? i have plenty of space on my iPad.

It can be that the playback movie we are rendering in the background is messed up for some reason. Please try to press and hold the play button for a couple of seconds. This will force a re-rendering of the playback movie. You should be informed by a progress bar about the process.