The reason is related to how silverlight handles loading modules in app domains, it does not allow more than one version of a dll so it ignores new version until you restart your application.
Hope this helps,
From: [email removed]
To: [email removed]
Date: Wed, 27 Feb 2013 11:29:53 -0800
Subject: Re: Reloading an updated version of XAP through DeploymentCatalog does not recompose correctly [MEF:404786]
From: highdownts
Hope this helps,
From: [email removed]
To: [email removed]
Date: Wed, 27 Feb 2013 11:29:53 -0800
Subject: Re: Reloading an updated version of XAP through DeploymentCatalog does not recompose correctly [MEF:404786]
From: highdownts
Did you ever solve this issue? I am going down a similar path with switching to MEF instead of Prism to download modules. Thanks...