iw been having same broplem but may i ask where you got your vids ? from other tube sites? not really sure but they are quite strict about videos they accept i think . got 1 video myself to Phub but it was so sht quality as .flv :P was 180mb -->30mb

well my advise would be try get some from torrenz or so some little more older wich has no Watermark yet and they are good quality movies hope it helps even little