I'm experiencing an issue with my Umbraco + Courier setups that is causing making my home page unable to be edited & published.

I can transfer just fine, but on the destination site, the home page + all children are grayed out in the content tree, like they are unpublished (but it still shows up when accessing the URL). When I try to publish the home page, I get the following error:

Item has already been added. Key in dictionary: 'src'  Key being added: 'src'

I've tried deleting this entire tree and publishing it all again, but the same error occurs. This is one reason that I think it might not be Courier, but rather the database, but I'm unsure.

I've also touched the web.config and that didn't help. Resetting the App Pool isn't really an option in my situation as my client hosts their site and I don't have continual access to reset.

I'm running Umbraco v 4.11.3 & Courier 2.7.5.1 and transferring up to Umbraco v 4.11.6 & Courier 2.7.5.1.