It was likely just the ongoing server problem. I am uploading some pictures here as attachments as well as through links and it went smoothly so far. The server error seems to be a capacity issue, so the more users and guests browsing the forum (and tying up the server database) the more the errors will occur.
I did have to hit the 'POST REPLY' button twice, but it went though. I have found that if the site does not go quickly when you hit a button/link, i usually hit it again. Sometimes it takes 3 clicks. Like i mentioned in the other post, the problem comes and goes with how many people are actively using the site. I would try it again and see if it will go through. Sorry for all the problems here lately.