Posting Links

Sometimes when I post a link, it doesn't work and they lead to a "Not Found" page. It started happening with the upgraded site. Has anybody else experienced this?

not so far but let us know the next time it happens I will keep an eye out.............

I figured out how it happens. When I put a link and then preview the post, the link gets messed up. I think I'm the only one that is experiencing this glitch. It's no big deal. I'll put the link after I preview the post.