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Silverlight 2153 Initialize Error

I've been working with a client to attempt to resolve a 2153 Initialize error for Silverlight.  I've done my due diligence but having no luck.  Could anyone provide some help?

Here are all the knowns

  1. This is a v4 browser app with minRuntimeVersion init param specified as 4.0.50401.0
  2. The error began occurring after a recent deployment. 
  3. Is not global.  That is to say that it affects 5 known machines out of more than 130 in use.
  4. The host client machines range from WinXP IE8 to Win7 IE9&10
  5. Web Server is WinServer 2008 R2 STD with IIS 7.5.7600.16385 
  6. The error is presented as a scripting error before SL has had a chance to even load the app.  Since its a scripting error there is nothing logged in event viewer.
  7. Error arises in IE and Google Chrome
  8. Able to hit other sites with SL and the SL plugin will function properly.

Here is what has been tried and unsuccessful thus far

  1. Clear browser cache
  2. Remove, assert registry SL keys removed, reboot, re-install Silverlight
  3. Disable content compression from IIS
  4. force content expiration in IIS
  5. Disable assembly caching
  6. Xap and Manifest has been verified as complete for both Parts and ExternalParts
  7. IIS Reset with above settings' state
  8. Added ?ignore=xxx to the SL plugin source

Any thoughts?

Thanks in advance,

-Ryan


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