[Plugin: Smart YouTube] videos not adapted for mobile

Hi, I use extensively this great plugin on my main blog https://www.kotonteej.com and it works fine.
My site has a mobile version through the use of the WordPress Mobile Pack and this works fine too.

In the tests I did months ago, it seems to me the videos’ size was properly adapted when the pages were seen on mobile. Since the last update(s), this is not the case : the size stays as big as on a computer.

Plus, each time I try to play a video, I get the following message “An error occured, please try again”, although I can visit YouTube directly and play videos with no problem.

the phone I use to test uses the Android OS, version 2.2.1

Does anyone have any clue ?

Sincerely
DJM