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I don't see these links in Firefox or anything in the source code that screams "ads".

I suspect they are being added either by a browser addon you have installed  (since you only mention that they appear in Firefox) or some other adware you have on your computer.

Try disabling all browser plugins to see if the links are still there.

I ran your site through ScreamingFrog which threw up 20 URLs that through 40x errors.

http://www.farmison.com/christmas is linked to from  http://www.farmison.com/community/blog/christmas-with-farmison/

Also take a look at http://www.farmison.com/community/blog/christmas-cheese-competition/ which links to some removed pages.

The /christmas URL should not 404 you should either 301 redirect it somewhere or leave it online ready for this Christmas!

I would set up an Adwords ad on your name pointing to your website as I can't find your site on the first page of organic listings for your name.  They'll certainly introduce you by name and probably put it on screen.

Dev team are looking into it, must be quite a complex htaccess issue. Will get to the bottom of it this week and post any findings.

It is just a small affiliate site I am looking at - this page creates a 404.

http://www.insure-uk.com/post-office-car-insurance.html

Currently testing on some beta servers. Hopefully should fix soon as otherwise it will lose indexation.

Hey

I have recently come across an issue with several of a sites urls being seen as a 404 by bots such as Xenu, SEOMoz, Google Web Tools etc. The funny thing is, the pages exist and display fine.

This happens on many of the pages which use the Modx CMS, but the index is fine. The wordpress blog in /blog/ all works fine.

The only thing I can think of is that I have a conflict in the htaccess, but troubleshooting this is difficult, any tool I have found online seem useless.

Have tried to rollback to previous versions but still does not work.

Anyone had any experience of similar issues?

Many thanks

K.

I would set up an Adwords ad on your name pointing to your website as I can't find your site on the first page of organic listings for your name.  They'll certainly introduce you by name and probably put it on screen.