I had a problem after upgrading to 3.5.1 When I created a new Gallery, none of my images showed, only my captions.
I gradually, by looking at the text view of old galleries and the new one I created found link=”file” was missing from the gallery shortcode.
I switched to the text view of my page and manually put link=”file” in the gallery shortcode and all the images appeared.
[gallery link="file" ids="3742,3743,3750,3751,3752,3753"]
I then tested the wp gallery feature and even though I had selected link to file before Inserting, wordpress 3.5.1 didn’t include link=”file” in the gallery shortcode, so none of my images showed. (It would include link=”post” if I selected Link to Attachment from the dropdown, but not link=”file”, until after I had firstly linked to Ataachment and then went back in to reset it to file.)
Don’t know if that will help you though, as I don’t use Gallery Reloaded