Converter Issues
These issues are related to using the StoreFront Converter plug-in.
Error message: 'The extension 'Apogee StoreFront Converter' does not contain valid signature' 
This message may appear during the installation of the StoreFront Converter plug-in. Two causes are possible:
The Adobe Extension Manager may be outdated. Go to https://www.adobe.com/exchange/em_download/ to download the most recent version of the Extension Manager and install it. Take into account that some plug-ins block the auto-updater of Adobe. A manual update may be the only way of making sure you have the latest version of the Adobe Extension Manager installed.
You may be trying to install an outdated version of the Apogee StoreFront Converter plug-in. Download the most recent version in StoreCenter, by clicking the Download Plug-in link in the left part of StoreCenter navigation bar.
'Error #1009' message when exporting an InDesign document 
When exporting an InDesign document to a StoreFront Package, the process stops with a '1009' error message if there are missing fonts in either the InDesign document or any of its embedded files. To avoid this notification, make sure all fonts are loaded and export the document again.
Fonts shown in the Online Editor are not the same as those of the original InDesign document 
To solve this problem you must make sure the computer on which InDesign is running has full access to all the fonts used in the document. Sometimes the StoreFront Converter doesn't have the same access rights as InDesign.
Add the fonts to the InDesign Fonts folder inside the InDesign application folder. Now create an InDesign package and check if all the fonts are present in the Fonts folder included in this package. If so, use this InDesign package to create the StoreFront package.
If this doesn’t remedy the problem, try installing the fonts in your operating system and create a StoreFront package again.
doc. version 6.0.4