This is most likely caused by a server configuration issue that Interspire is usually unable to correct for you. You will need to contact your web hosting technical support or server administrator to have the issue resolved.
The issue is that static .htm or .html files are being sent by the web server with an incorrect content type. The correct content type should be "text/html" but we have observed some customer websites will send these files with the content type "application/x-httpd-php" which some browsers will treat as a downloadable file, causing the WYSIWYG editor to malfunction.
The problem URL for you to send to your hosting support is the following:
{your website URL}/lib/tiny_mce/plugins/advimage/image.htm
For example, if your Website Publisher is installed at www.example.com/websitepublisher the URL would be:
http://www.example.com/websitepublisher/lib/tiny_mce/plugins/advimage/image.htm
Once this content-type issue has been corrected, your WYSIWYG editor dialogs should function correctly again.

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