Having trouble finding an app that will smoothly play .MKV (matroska video) files. (For those unfamiliar with the format, MKV is commonly used for HD video.) The popular QQ, Mobo, Mvideo, and MX players result in choppy, un-synced play. These apps do the same on my 2.1 device. On my older Android 2.1 tablet, the native "camera" app plays these files perfectly, but I can't figure out how to get them to play on the Le Pan camera app. I'll keep trying more apps.