In Internet Explorer 9, when I drag items in this example of the jQuery HTML5 Sortable plugin, the dragging item disappears, even though it states that it supports IE 5.5+. It looks like this:

Any ideas how to fix that?
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You could probably fix it easily by switching to jQuery UI – the official UI library for jQuery!
I’ve used the drag and drop component numerous times and have never noticed any disappearing issues in IE.
Of course, it could be something to do you your current HTML/CSS, or some other conflicting script. Switching out to another plugin would help demonstrate whether it was your code, or the plugin that was at fault.
EDIT:
Problem on the actual demo site for the plugin…Have retained above comment as this is still a valid debugging path in situations like this where it is (or at least could be) custom code causing a problem…