The default value in my plugin is blank.
Are any of the other text fields blank (such as 'Text Color' or 'Frame Color' whose default values are also 'ffffff')?
Is the default value for 'Background Color' (in line 227 of WP-SimpleViewer's 'config.php' file) 'ffffff' or blank?
If blank, change the line to the following:
<input type="text" id="backgroundColor" name="backgroundColor" value="ffffff" />
Otherwise, try reinstalling the plugin following these instructions:
(1) Deactivate WP-SimpleViewer from the Plugins page in the WordPress Dashboard
(2) Delete the 'wp-content/plugins/wp-simpleviewer/' folder
(3) Download the latest version of WP-SimpleViewer from this page: http://simpleviewer.net/simpleviewer/su … pleviewer/
(4) Reinstall and reactivate WP-SimpleViewer following the instructions here: http://simpleviewer.net/simpleviewer/su … r/#install
If this still does not solve the problem, then you could make sure that your WordPress installation is up-to-date (v3.2.1) and you could try temporarily disabling all other plugins and themes to make sure that nothing is interfering with WP-SimpleViewer.
If this works OK, then you could re-enable your installed plugins one by one until you find the one that is causing the problem.
SimpleViewer Support Team.