I am trying to use the column reorder feature in a web page I am trying and it was failing with a viewstate error when I do a postback. I then tried downloading the latest EO demo and tried running that with no modifications and I still get an error when I use the postback button.

The error is;
'Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.'

I can make the error stop by using enableviewstate = false but then I lose the reordering on postback.

This is happening with no modifications to the download. I then tried using the online one and I am getting the same thing. I tried a few PCs here and they all do it with the online demo.

Do you have any idea of what could be causing this issue for me please?

Hi,

We have posted a new build that should fix this problem. You can download the new build from our download page.

Thanks!