Have you changed the extension to .png in the post icon manager and set the correct path? It's still showing as
icon1.gif when you should have changed it to
icon1.png
Alternatively, go into your
admincp >>
vboptions >>
Thread Display Options (showthread) and scoll down to S
how Default Post Icon and make sure the path is correct in the field.
Try inserting these both in the post icon manager
images/icons/icon1.png and in the
Thread Display Options (showthread) options that I mentioned above. that will fix your problem.
http://forums.jetgaming.org/images/icons/icon1.png