Did you just make your ticker and then copy and paste the URL Image into body of the signature and try to post? Cause I did that once and my ticker wouldnt work. What I had to do was the following
A) Go to your setting options to your "Edit Signature"
B) Up where the fonts and edit your text stuff is, hit the little yellow box that has the mountains on it. Another box will come up saying enter the "URL" of your image. There you will copy and past your URL of the image you just created, and then once you hit OK it will be put into the body of your profile, and try to hit preview. It should be there.
If not definitely try talk talking with a Mod. They might be able to help you out.