If you are using Graphical Installer for Inno Setup together with InnoTools Downloader (free third party plug-in to download files during installation) you may noticed the ITD plug-in has unpleasant bug.

E.g. like in this question: http://stackoverflow.com/questions/17813754/changing-layout-options-of-inno-setup-downloader-tool-with-graphical-installer

ITD plug-in creates simple form which contains download progress bar and few labels with download information. This form is not visible in regular installers (because they are usually grey). The problem is when you try to use ITD with background skin - the form becomes visible as grey rectangle and the installer does not look cool:
ITD bug

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