In PE10, I used the Photoshop.com preset option in the share tab and the file rendered and uploaded and looks terrible. There are balck bars on the top or the sides, changing from shot to shot... when a pan and zoom happens on a picture the picture moves accross the screen to fill in where the black bars are, etc. Just weird and BAD! Everything looks perfect when rendering AVCHD on a disk. What is going on?
What is the Project Preset, and what are the full specs. of your Sourece Footage.
Usually, black bars are caused by a mis-match between the Project Preset and the Source Footage.
Good luck, and please let us know more.