I did a search and noted that others had this problem but I believe the cause of mine is directly tied to upgrading my WordPress software.
I use lunar pages and used fantastico to upgrade my WordPress software to 2.2.1. Immediately following the upgrade, my form to upload pictures (in the Write Post page) disappeared. I cleared the cache, did Cntl F5, I do not have any FireFox ad-ons that are blocking it nor do I have any other software blocking it.
I tried opening up the Write Post page in Internet Explorer and where it would have been was a Page not Found error. I'm stumped! Any suggestions? Thank you so much.