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i having this problem, the category i created ( not upload file yet) has gone after one night, do a quick check the database still showing all the category detail, checking the code
$imgcat_handler = xoops_gethandler('imagecategory');
$imagecategorys =& $imgcat_handler->getObjects();
xoops_cp_header();
echo '<h4 style="text-align:left">'._IMGMANAGER.'</h4><ul>';
$catcount = count($imagecategorys);
after this i doing an echo $catcount, i getting 1.. which is the new category i just created... other 4 category all cannot show, trying to upload 1 file and change the category id for that file to the category id which doesn't appear, not working.. update the system module, not working too