Selctor no more working

Selctor no more working

Hi,

I just upgraded from version 1.6 to 1.10 ; there are things that are not working any more.
Exemple :
.myclass input:checked => not working
.myclass input[type=checkbox]:checked =>  working !
but why ?

Another issue: I have a div whose ID is "myid". In some case (it shouldn't but it happens) this div may be repeated twice.
Applying $("#mydiv").remove() removes only one instance at the same time. I have to repeat the .remove() to remove all div !

Is there an explanation to these cases ?