I have read old posts but I haven't found a solution.
After add a new slideshow I try to add the images so I click the "Upload/manage Images" button and popup the media lightbox.
Under "media library" tab I can navigate the images but I can't selects (only delete link appears).
Then I must upload the images (again in some case) and after click on "Save all changes" button I have a new gallery but "Insert gallery" do nothing.
I use WordPress 3.3.2 and your last plugin 1.3.5 .
What the right way is?