Yes, me too. I’ve found that NextGEN has also prevented access to the theme customization page (wp-admin/customize.php), giving a blank screen. Only when I deactivated all my plugins and reactivated each one in turn did I realise it was NextGEN causing this problem and preventing me from uploading/inserting images.
I’d already had massive problems with galleries redirecting to the home page and I found that (non-existent) page IDs were shown, even though each gallery was set not to link to a page. I had to manually go through each of the 165 galleries, set them to link to a page, then go back and remove the link. Only then did the galleries stop redirecting to the home page.
I’ve spent hours and hours trying to get my site back together so I’m going to roll back to an earlier version and will be reluctant to upgrade again.