For everyone stuck in the same solution:
in page.xml under app/design/frontend/base/default/layout (or your custome page.xml)
change the line
<block type="core/profiler" output="toHtml"/>to
<block type="core/profiler" output="toHtml" name="core_profiler"/>Looks like there were some changes in the way Magento handles this call!
This solution work so far for 1.4.0.1 to 1.4.1.0……