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Commented Unassigned: Error 0x800a138f - JavaScript runtime error: Unable to get property 'length' of undefined or null reference [27848]

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I have a page that was working fine with a tree control on the left and a calendar control on the right. I added a tab control, and I started getting this error. It does not matter where I ad the tab control or what the tab control has in it - it can just be a text label in each tab.
In my research I found that this problem, or something very similar, happened with previous version and the solution was to replace the Script Manager with the control toolkit's script manager. But with version 15.1, control toolkit did away with its own script manager in favor of the default asp script manager, which I use on my page. I am using IE 11, Visual Studio Ultimate 2013, .NET 4.5.
Help please!!!
Comments: I created a brand new ASP.NET Web Application project, using VS Ultimate 2013, .NET 4.5, Ajax Control Toolkit 15.1. On the front page, I put just one button and an update panel. inside the update panel, I put a tab control with only one tab that just has the word "hello" in it. On the button's click event, I tell the update panel to update itself. I get the error... If I don't use update panel, but just have a label inside the tab control, and in the button's click event handler I change the text of that label, I also get the error... but only in IE (v.11 with automatic updates). I do not get the error in Chrome. Telling my users to only use Chrome is simply not an option. This is clearly a bug, please fix this!!!

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