[TYPO3] Typo 4.2.1 + css_styled_multimedia bug

[Chris]

Hello,

there's a bug with the extension css_styled_multimedia (last version : 
0.1.3) in Typo3 4.2.1 :
the field "width" shows two times in the backend and therefore cannot be 
saved in tt_content.

I made a test : via phpMyAdmin I put the value in the imagewidth field 
but it doesn't solve anything, in the backend it doesn't show in the 
input field, except looking at the source the value is kept in a hidden 
field.

This bug doesn't show in Typo3 4.2.0

If anyone has a clue, I'd like to understand what happens here ?

Regards,

Chris