Uploading an Avatar through an URL

[Beauty4123]

whenever i upload a new set, i always upload my icon on tinypic and post it in the URL section of the "Edit Avatar" button. but now when i try to do that, it won't let me. it says there's an error or something. but when i upload an image from my computer instead of an hosting site, it works. just recently has this been happening, so does anyone know what's wrong? i'd appreciate the help.