[Dave]

Have you tried using the style variable replacement tool to convert: "http://www.lf3performance.com" to "https://www.lf3performance.com"? Also try clearing the server cache in the AdminCP under maintenance.

When I check the source code of the forum, I still see a couple of references to the HTTP version of your site.

(index):93 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/spacer.gif'. This content should also be served over HTTPS.
(index):280 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/misc/navbit-home.png'. This content should also be served over HTTPS.
(index):329 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/buttons/collapse_40b.png'. This content should also be served over HTTPS.
(index):345 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/forum_old-48.png'. This content should also be served over HTTPS.
(index):378 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/buttons/lastpost-right.png'. This content should also be served over HTTPS.
(index):429 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/forum_old-48.png'. This content should also be served over HTTPS.
(index):447 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/subforum_old-48.png'. This content should also be served over HTTPS.
(index):477 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/buttons/lastpost-right.png'. This content should also be served over HTTPS.
(index):529 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/buttons/collapse_40b.png'. This content should also be served over HTTPS.
(index):545 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/forum_old-48.png'. This content should also be served over HTTPS.
(index):578 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/buttons/lastpost-right.png'. This content should also be served over HTTPS.
(index):629 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/forum_old-48.png'. This content should also be served over HTTPS.
(index):666 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/forum_old-48.png'. This content should also be served over HTTPS.
(index):696 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/icons/icon14.png'. This content should also be served over HTTPS.
(index):699 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/buttons/lastpost-right.png'. This content should also be served over HTTPS.
(index):750 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/forum_old-48.png'. This content should also be served over HTTPS.
(index):783 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/buttons/lastpost-right.png'. This content should also be served over HTTPS.
(index):865 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/misc/forum_stats.png'. This content should also be served over HTTPS.
(index):881 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/misc/legend.png'. This content should also be served over HTTPS.
(index):884 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/forum_new-16.png'. This content should also be served over HTTPS.
(index):885 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/forum_old-16.png'. This content should also be served over HTTPS.
(index):887 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/category-16.png'. This content should also be served over HTTPS.
(index):888 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/statusicon/forum_link-16.png'. This content should also be served over HTTPS.
(index):1 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/misc/arrow.png'. This content should also be served over HTTPS.
(index):1 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure image 'http://www.lf3performance.com/images/buttons/search.png'. This content should also be served over HTTPS.
(index):1 Mixed Content: The page at 'https://lf3performance.com/' was loaded over HTTPS, but requested an insecure favicon 'http://www.lf3performance.com/favicon.ico'. This content should also be served over HTTPS.

<link rel="Shortcut Icon" href="http://www.lf3performance.com/favicon.ico" type="image/x-icon" />

	var IMGDIR_MISC = "http://www.lf3performance.com/images/misc";
	var IMGDIR_BUTTON = "http://www.lf3performance.com/images/buttons";

I also noticed that the site uses the www subdomain at some locations where at other locations it doesn't use it.