I recently tried adding a link to another post within the Quick Reply box using the full permalink address, but when I save the reply, then click on that link, it seems to add an additional "forums.precentral.net" before the "http://" address, like this:

I tried this a few times by closing then opening the same post and using Quick Reply again, and it happened the few times I tried it. Outside web addresses seem to work fine within the Quick Reply box, so only the permalink, or forum thread addresses give me this issue. This doesn't happen when I use the Advanced Reply page instead. I am using the Google Chrome browser.