This has been an issue in the past but was fixed a while back. It usually only arises for people using Internet Explorer. May I ask, what version of Internet Explorer are you using? If you're not sure, then that's fine. I am quite certain that the fix I made a while back should work for all version...

Im trying to post a pic for my character, but it says:

Error(s) Have Been Found While Trying to Upload This Photo; Photo Was Not Uploaded:

• You can only upload .gif, .jpg, .jpeg, and .png image formats.

But ive tried to post the pic with all these file types. why wont it post?