I'm dabbling in making a static widget from scratch, and I keep getting "not a valid widget" when trying to import the swf. I've been through the certificate widget project and that works for me. Thanks in advance.
For this issue please take patch mentioned in blog post - http://blogs.adobe.com/captivate/2009/05/captvate_4_patch_update.html
The widget template code has been modified to take care of this.
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