Problem after update

 Hello,

after updating to 2015.2.728.40 from 2014.3.1202.40 I am receiving the following error on a single gridView in my application

Unable to cast object of type 'Telerik.WinControls.UI.ColumnLayoutHelper' to type 'Telerik.WinControls.UI.StretchColumnLayoutHelper'

When the form containing this grid first opens, the grid columns are messed as in UI-messed.png

If I try to refresh the gridView, I get the error above (error.png)

Disabling any of

grid.BestFitColumns()
grid.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.None​

Will not cause the error, but the columns are still messed up.

If I add a new row (or the grid contains rows from the beggining) the columns are shown fine (UI-fine.png)

and I get no error when I try to refresh.

I noticed that the error pops when I am trying to add the new dataset to the grids dataSource

This happened only after the update and only in a single gridView of my application.

Any thoughts?