Been having issues since the update, I have answered your questions about what I have done and would like. I have searched and there are a couple of other similar problems but apparently I am supposed to open my own thread.
1.Please tell me exactly what you want! So you do not want thumbnails you want to play the videos normally in place as they are now or am I wrong? Do you actually understand what the thumbnail mode means? Because to me it looks like you have no idea.
answer: I would like my existing videos to display as before. I do not use thumbnails
2.Why where there thumbnails on that site if you do not want them?
answer: I added the thumbnail code to try to see if it would work
3.What exact shortcodes did you use on the sites that are not working and what exact shortcodes did you use on that site that are displaying thumbnails even if you do not want them?
answer:[youtube id="TYB8agv1Dwk" mode="normal" align="left"]
4.Why did you speak about "editing thumbnails option for all videos" please explain? Did you mean by that editing a mode="thumbnail" into your shortcodes or what? That did help? If yes in what way? From being not displayed at all to being displayed as thumbnails?
answer: installing colorbox and adding the thumbnail option helped but I do not want to use colorbox, would prefer as before
5.What options do you use? Specifically the 'mode' option.
Plus, I have as asked by you, downloaded the version and uploaded it. I am using WP3.7.1 and their theme 2012; simple site with no modifications and 10 plugins. Which I turned off for five minutes to see if there was a conflict
I really hope this is of use to you Nico, I will leave this site like this for another 24 hours if that is of use