Why DU Meter would not stay on top of other windows even if configured so?

DU Meter window sometimes hides beneath other windows instead of being always on top as selected in the DU Meter options. This is actually a bug in Windows 7 and Windows Server 2008 R2.

In order to fix this issue, please visit Microsoft Knowledge Base Article KB2587473 and request the hotfix download from Microsoft. After installing this Windows hotfix you will be prompted to restart your computer and the problem should be resolved.