Royce pointed out a problem with posting attachments and I had the same problem, plus noticed the pages were loading very slowly. After some homework (internet searches) I was able to fix the it.
I'm limiting the file size to 128kB per attachment, 6 attachments per post and a total limit of 512kB of post.
The 128kB figure is the default for this forum and the other two numbers were boosted.
I know some use photobucket for attachments and that is fine. I prefer not having to leave the forum to view the attachments and the flashing ad telling me there is something wrong with my computer and I need to click on it bugs me.