Pretty much what the title says- I was wondering why all the Instructables I tried to view were 404ing, until I logged in to post this thread and they started working. I tried in IE and Firefox and saw the same behaviour on both browsers.

If this is just my computer spazzing out then I'll ignore it, but if it's a real problem then presumably it is putting off a lot of non-members by presenting a fundamentally broken site.

The 404 message:
We're sorry, the URL http://www.instructables.com/id/DIY_Solar_Heater/ is either incorrect or no longer available.

If you followed this link from outside of one of our sites, we'd appreciate if you'd let the owner of the referring page know.

If you followed it from within our sites, or if you believe you received this message in error, please send e-mail to webmaster@instructables.com and let us know that you got error 404 looking for http://www.instructables.com/id/DIY_Solar_Heater/ which was linked to on page http://www.instructables.com/tag/type:id/?sort=RECENT''