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Are you on the most recent version of Chrome? It is possible, if you are, that you are running into the issues noted within the article below:
If this is the case, I would suggest (in the mean time) to use another browser. Firefox should work without a problem, as will Internet Explorer or Safari.
I know a lot of people have an attachment to Chrome, myself included, but for now, this should fix the problem.
I hope this helps!
Sling Media Moderation Team