Video Deterioration over tiem????

I created and posted to a SharePoint library some Articulate Presenter coureses over 3 years ago. They were fine several months ago. When I accessed the videos this month the presenter panel was cropped. I only saw half the contents panel and just the top of the navigation bar.  I republished one of the courses and it appeared fine after I reposted it on SharePoint.

I viewd the other presentation on my bosse's 30 inch LCD and it was fine.

My boss said it could be my browser (i.e 8). What settings in the browser could cause this? Do swf videos deteriorate over time?

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