Could you please describe in detail how you have your account setup so I can try to replicate it and see if I can duplicate your problem. The more details you can provide will help.
You are running Joomla 1.6.0 stable version?
Is Joomla installed in public_html or do you have an addon or sub-domain?
When you were using a custom icon you had just the icon name in the Custom Icon Filename field and the Custom Icon Path you left blank?
The module doesn't accept the custom icon. The only good way is to put my icon in /administrator/templates/bluestork/images/header (bluestork is the template I have choosen for the admin). But if I do it I obtain only the name Icon Label.
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