Well, it’s working in RC1 now, that’s for sure.
So thanks, I for fixin it up!
as far as I am concerned, it should be marked as resolved!
Just noticed something:
my experience from the previous only appears in posts written before updating to beta 3.
new galleries work fine.
the galleries before beta3 were like this in text mode:
[gallery link="file" columns="5" orderby="post_date"]
the gallery created after updating to beta3 is like this:
[gallery ids="647,650,621,623,617"]
basically, it looks like the image ids are not there in pre-beta3 galleries and this is causing the problem.
(confirmed by removing the id tags from the second code above, it then tries to list all images from previous posts as part off the gallery and does not allow drag and drop. also, when editing an older post, the gallery gets updated with all image ids (which are a few hundred) from other galleries, but then the galleries can be changed properly (drag and drop working))
so it looks like there has been a change in the gallery tag which required changing old posts in the database to get the image ids set in the gallery shortcode tags.
anyone able to help out?
