I am encountering an issue when combining RadMenu with LightWeight Rendering on a page with a RadGrid using Classic Rendering. Enabling Filtering on the Grid causes the submenu items on the RadMenu to appear incorrectly.
I am using 2015.3.930.40
If I render both controls with LightWeight rendering or render both controls with Classic rendering everything appears correctly. It only appears incorrectly when Filtering is enabled on the grid.