3D FlipBook - Hi, Yesterday I left a message to report a problem with the plugin on my website. I suppose it takes longer than a day to

Hi, Yesterday I left a message to report a problem with the plugin on my website. I suppose it takes longer than a day to respond. Could you please check? Shortly, the first created flipbooks (about 8 months ago) would not load neither on their WP pages, nor in the plugin preview itself. Very strange, because the last book I made ( 2 days ago ) loads perfect, BUT, the other 6 are gone “missing”. I can see their content pages in the admin panel of the plugin, settings, etc. everything is intact, but the flipbooks do not load. Please, respond asap. Thank you!