No, I didn't try that (until now), but I did clear all my internet files, closed, and reopened IE. 

I think it didn't work because I'm not using the standard skin.  I have a custom one on that I downloaded off the net.  I just realized that it probably has a setting that I need to change within one of its files.

I recently ran into the same issue and came across this thread. I came up with an alternate solution that might be helpful to others since it only involves making a change to your skin, rather than making a change to the \admin\ users\manageuser.ascx file.  Making a skin change is in my view less "risky" as you don't have to worry about a DNN update overwriting the change and you can control the change on a page by page and portal by portal basis, instead of forcing the change globally.

Simply go into your skin (eg "\website\portals\_default\skins\DNN-Blue\Horizontal Menu - Fixed Width.ascx") and replace

<dnn:USER runat="server" id="dnnUSER" />

with this

<b class="SkinObject"><%= UserController.GetCurrentUserInfo().Username %></b>   

This will replace the dnnUser control that links to the Manage User page with a simple string containing the username, using the same css style as the original dnnUser control.

Eric