No way to get the new drag and drop feature to work properly ???? more tests

For some reason, on my linux production server the drag and drop feature does not work while it works propely on my wamp develoment server.

Every time I try to drag an element, a snippet for example, there is no way to put it into the editor window, it appears un red, and return back on the left column as soon as I try to drop it.

Has anybody already experienced this ?

Thanks for help

Philippe

web site : http://www.art-impulsion.com

More tests :

It does not works properly on my portable pc on Firefox, or safari, and I have not been able to do anything with IE9 (but I know it’s not supported yet).
My portable pc has a 1900*900 pixel size.

On the opposite, I have been able to make it works correctly on my desktop pc using firefox and IE8.
The screen is standard 1280*1024pixels.

Both machines are running windows 7 64 bits pro version.

I feel like it is related to the 16/9 screen.

Has someone been into this ?

Philippe