Can the exception maybe caused by the Context Menu?

I use a ultra toolbar manager for the grid's context menu... the items are dynamically created in code some time after the grid layout has been initialized...

Do you have a kind of debug version of the grid which makes some trace logging so that i have an indication what the exception causes?

your sample works here... i will try to recreate the problem in the simple sample

I understand. How about we come at this from the opposite angle. I'm attaching a very simple sample here with a grid in v9.2 and a couple of buttons to save/load the layout. There's also a saved layout (saved with 9.2) already included in the bin folder.

Try updating this project to v10.1 and click the load button and see if that works for you. It works for me. So if this causes an exception when you do it, we will know that the problem is already fixed internally and will be fixed in the next service release.

If it works for you, then we know there is something else at work here and we will probably a sample from you in order to find out what it is.

Ok, i try to create a sample but it isnt really easy to recreate the issue outside my real app