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Extension not loading (blank panel) - code signing issue?

Aug 22, 2013 9:11 AM

I have an issue with my Extension with Windows 8 and Photoshop CC. When I try to call the extension, the extensions panel pops up but keeps blank, then shortly after a dialog box shows "Cannot complete command because the extension could not be loaded".


  • I used EB 2.1 to build the extension
  • I used a self made code signing certificate when building the .zxp
  • It installs fine with Extension Manager CC, just showing an alert because of the untrusted publisher (me)
  • With Windows 7 (and Photoshop CS6, I don't have CC there) it loads fine


By chance I discovered that the registry entry


"PlayerDebugMode"="1" in [HKEY_CURRENT_USER\Software\Adobe\CSXS.4]


helps the extension to load! Since that registry entry is claimed to "run unsigned extensions during development" (see EB docs), I wonder whether the loading error is an code signing issue showing up only with Photoshop CC (and Windows 8?).


Additionally, in the "csxs4-PHXS.log" I found the line


2013-08-22 14:09:38 : INFO  Return value of PlugPlugLoadExtension call : PlugPlugErrorCode_invalidSignature


which seems to approve my assumption.


Does this mean, that I need a valid (trusted, non self made) code certificate to deploy my extension for Photoshop CC (and later)?


Any help is very appreciated!

  • Currently Being Moderated
    Aug 27, 2013 8:29 AM   in reply to szerner

    I had the same problem. The manifest editor created an invalid path to the swf.

    I edited the xml to change the swf path from "./" to "../" and the screen is no longer blank.

    Hope this helps.


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  • Currently Being Moderated
    Aug 27, 2013 10:08 AM   in reply to szerner

    If you create an mxi file you can convert it to a zxp or just use the cert that Adobe Exchange Packager creates. To download Adobe Exchange Packager sign in with your Adobe ID here:



    Then go to Resources. Packager might be able to help...

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