SEOMoz Crawler and rel_canonical_tag Errors

[SammyT]

This tag is showing up on category pages (that do not have a duplicate page on the site). In mid November Google cut our traffic by 30%. Could this tag be confusing the spider?

According to the moz crawler - we seemed to be dinged for this on 95% of our pages. Is this hurting us? It seems to direct back to the same page.EG: From the FMI3600 Page http://www.brick-anew.com/FMI-3600-Fireplace-Doors.html:  http://www.brick-anew.com/FMI-3600-Fireplace-Doors.html"> There is only one page for the FMI 3600 Fireplace Door category - however, it does have the same products on it as other FP Door Category pages,

[EricaMcGillivray]

Have a canonical tag on your pages, regardless of whether or not you have the same page in other places, will not harm you. (It would only harm you if you had it on two duplicate pages saying that both were the canonical version.)

I'd check your site for similar or thin content, which is another thing Panda hit. Yes, you may not have direct duplicates, but if your content on the category and product pages are either thin or very similar to each other, you can still get hit. I'd suggest reading this post, which is basically everything you need to know about Panda.