Why won't videos play after opening multiple files

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http://askubuntu.com – Doesn't matter the player.. tried SMPlayer and VLC. After opening numerous video files, the players only play audio. Video will play in Chromium and Firefox, just not in video players. I'd watch a bunch of trailers I downloaded, and after say 10 or so, just get audio. I must say I'm vexed. I'd even need a solution, just an idea of what is the issue. (HowTos)