Problems with post.php in 1.5.2

OK, so I have a strange issue. When adding or editing a post that contains a link, post.php often just “hangs” (read it continually tries to load itself). Now, the content is updated, but the page doesn’t reload to the original post or the admin section.

So far, I’ve tracked the problem like so. If say, post X has this link in it (of course in proper a href format)

post.php fails as described above. If I remove said link, the problem disappears. I also had the issue in another post and ended up replacing

http://www.google.com/talk

with

http://www.google.com/talk/

and the problem again resolved itself. However, adding a / to the first referenced link has no effect on the problem. An ideas?