The content does not use the full screen area.

The content must always use the device screen to its full extent. This means that the content must fill the entire display area and cannot be cropped in any way. Test your content on different device models because it may display differently on different devices.

For more information on scaling images, see this Top 10 QA Failures article
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The Symbian package file specifies the incorrect operating system.

The platform identification code (Platform ID) is used during installation to check the compatibility of the appand the operating system. If the Platform ID in the .pkg file is incorrect, the device displays an error message during installation, even if the app and the device are compatible.

For an example on how to specify the platform, see this Top 10 QA Failures article.

The content does not prompt for an installation drive.

The installation process should prompt the consumer to choose a drive on which to install the content.

This problem arises if the Symbian package file hardcodes the installation drive. Be aware that some older Qt tools generate a Smart Installer wrapper package file that hardcodes the installation to drive C. For example, specifying c:\private\2002CCCE\import\MyApp.sis means that the Smart Installer always installs MyApp to drive C once the content is downloaded from Nokia Store.

To correct this problem, use the “!” character in the directory path for the installation as shown below. This allows the content to be installed on the consumer’s preferred drive:
!:\private\2002CCCE\import\MyApp.sis

For more information, see this Top 10 QA Failures article.

When the content is suspended in the background, the contentsound is not disabled.
Sound from the content should not play when it is suspended unless the content is a music player or a radio app
For information on working with audio, see this Top 10 QA Failures article.