Seams that FORMS elements in Chrome now have different box model and in this case fire the mouseleave event of the parent element. Anyway you can solve this bug changing few lines of code in mbExtruder.js; around line 160:

c.bind("mouseleave", function(e){
  if(extruder.get(0).options.closeOnExternalClick){
    if(!$(e.target).parents().is(".text"))
      $(document).one("click.extruder"+extruder.get(0).idx,function(){extruder.closeMbExtruder();});
  }
  closeTimer=setTimeout(function(){

    if(extruder.get(0).options.autoCloseTime > 0){
      extruder.closeMbExtruder();
    }
  },extruder.get(0).options.autoCloseTime);
}).bind("mouseenter", function(){
  clearTimeout(closeTimer);
  $(document).unbind("click.extruder"+extruder.get(0).idx);
});

1) Pass the event to the "mouseleave" listener function -> c.bind("mouseleave", function(e){...

2) add this conditional for the "extruderClose" activation: if(!$(e.target).parents().is(".text")) as shown above.

This controll verify if the clicked element is inside the container or not before activate the "onclick" listener to the DOCUMENT.

You can download the latest GitHub update with this bugfix: https://github.com/pupunzi/jquery.mb.extruder/zipball/master

Hope this can help you.

Bye, Matteo