@photocrati thanks, all fixed now – I had to delete the existing galleries from the page, then re-insert them with the IGW – for some reason the old galleries were using the following: <img class="thickbox" but when I reinserted them with the custom sort order they updated to <img class="ngg_displayed_gallery mceItem". This seems to have fixed the problem! Thanks again!
@photocrati – Sorry, I should have mentioned, I did some searching for answers before creating this post and have already tried the things you mentioned – no luck!
