i'm using the 5G FIREWALL from PerishablePress.com
then the adminimize icon won't appear anymore...
i went to investigate the issue and to my surprise there are 30+ lines of code to deal with a gif.... including base64_decode and header outputs
as i am running my own 1.8 version*, i just deleted all that and replaced with a simple
$menutitle = '<img src="http://myaddress.to/adminimize.gif" alt="" />';
* apparently, i am the only one in the planet having this issue that made me being stuck in 1.7.12