We upgraded our project to 4.0 yesterday and did a live release. Unfortunately for some reason on one of our pages the tab container does not display anymore. I've set a breakpoint at the end of code execution and the .Visible property of the container is True, but the generated HTML has a CSS tag set to make it invisible:
<div class="ajax__tab_xp" id="ctl00_PageBody_tbcTabs" style="visibility:hidden;">
If I use the IE8 development tools to remove the style property then everything displays correctly. Any ideas why the container is set to be invisible even though the code behind is setting it to visible?
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