The question was posted "How do I handle it when something I have planned has a glitch?"
It is important that your students be involved in the problem solving process. Remember that they are digital natives and the idea of work arounds is familiar to them. Allow them to take some ownership over solving the problem. Is there a different program to be used? Could you convert items into a different format? Be clear in the learning objectives and the tasks required of the class. This is one those places that we as teachers and digital immigrants have to get out of our own way. We don't have all the answers.