I also found this Warning it may be related to the error previously reported:
Warning: filesize() [<a href='function.filesize'>function.filesize</a>]: stat failed for /home/uncionmu/public_html/var/cache/fc.Icons.ideal_responsive.def_xcart_web_dir.0.en.0 .html in /home/uncionmu/public_html/include/templater/plugins/function.fancycat_get_cache.php on line 72