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The Iframe module seem to have some problems with XOOPS 2.4.
But You don't have to use a module to include iframes on your site.
Created a new file, save it as myiframe.php and put it in your root directory and run it (mysite.com/myiframe.php)
<?php if (file_exists("mainfile.php")) { include("mainfile.php"); } elseif(file_exists("../mainfile.php")) { include("../mainfile.php"); } else { include("../../mainfile.php"); } include(XOOPS_ROOT_PATH . "/header.php"); $xoopsTpl->assign('xoops_showrblock', 1); // 1 display right blocks $xoopsTpl->assign('xoops_showlblock', 1); // 1 display right blocks $xoopsTpl->assign('xoops_pagetitle', "MyIframe"); ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml2/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <iframe src="https://xoops.org" name="iframe" width="100%" marginwidth="10" height="500" marginheight="10" scrolling="auto" frameborder="0"> </iframe> <?php include(XOOPS_ROOT_PATH . "/footer.php"); ?>
edit:
found this. Another guy with the same problem. But no fix

So better use the code posted above.