I continually get Page Not Found messages from PBS when navigating to different pages around the Site. From that page I can then navigate to the exact page I was trying to get to in the first place, but it's getting really annoying. Is anyone else experiencing this?

I am on the site quite a lot and do not get Page Not Found messages. Can you give an example or two of what you are trying to do when you get the error?

Chris, it happens often. Usually it's when I'm on a page--say this forum page--and then go to the menu bar across the top of the page to navigate to a different area. It seems to happen most often when I click the "My Account" link in that menu bar, but it's also been happening when advancing through the pages on my WL (i.e., say I'm on page 2 of my WL and I click the arrow button to go to page 3, I'll get a page not found). It has also happened when logging in. The Site is bookmarked, so I usually access it from the same link, yet a good portion of the time I get the Page Not Found message. It's really frustrating.

I am also on the site all the time, and it also happens to me frequently.  Other glitches I've reported as well.  
I was hoping all of this would be a thing of the past with all of these changes.
 

I don't have this problem, but perhaps its could be caused by having stale data in your browser cache. To test this you can try clearing your browser cache or doing a hard refresh (Ctrl-F5) on the page that's giving you the error to see if that clears up the problem.