Respected UncleCheese,
I had an issue with the ImageGallery Drag & Droping of Images while reordering in SS 2.4.1.
But i have fixed it.
I think in SS 2.4.1 version u've missed this call to -> Requirements::javascript(THIRDPARTY_DIR.'/jquery-livequery/jquery.livequery.js'); some where arround line number 110 to 130 in yourSiteName/dataobject_manager/code/DataObjectManager.php.
For this purpose the drag & drop was not working in 2.4.1, Other versions are working fine so far.
I included this line ----| Requirements::javascript(THIRDPARTY_DIR.'/jquery-livequery/jquery.livequery.js'); |---- in the DataObjectManager.php. Then it started working fine.
Hope this will be helpfull-----
Regards--
Storm Striker