Of course if i used the default res 1100x500 it will stay that way no matter what my browser size is.
And well i did try clearing cache & all, using CCleaner Professional after i've closed my browser
but no changes. It's about the embed size. Your player sticks to 1100x500 NO matter what size i set the embed.
Added after 11 minutes:
640x360 - any res less than the default will be cropped.
1250x600 - similar size or bigger, player will appear in full.