ASP.Net Webforms – Dynamic UpdatePanels and UserControls issue

Have come across an interesting issues in ASP.Net WebForms when migrating a project from 3.5 up to 4.5.

The site in question is extremely dynamic, the page is built up based on configuration in a CMS fashion.

However in 4.5 we have a problem – when more content is added into the page via a button click, not all the markup for the content appears.

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