Can anyone help? Red X instead of picture

[MicMin]

I asked this question on the tech board but I don't think that board gets very many posts. Could anyone help here?

I made some signatures in this thread
http://www.disboards.com/showthread.php?t=931455
and some of the pictures have started showing as just a red X. I uploaded all of the pictures to the same site (Tinypic) and saved the pictures as the same type of file. Usually if it is a red X you can make it show by clicking *show picture* but it is not working this time. Some of the pictures show up correctly but not others. Anyone have any ideas as to how I can correct the problem? Thank you for any help.