I am upgrading our product from zk 5.0.8 to to zk 6.0.1 and ran into a problem with a grid. The page defines a paging element, as well as the grid. The grid cells are made up of HtmlNativeComponent objects. Paging forward in the grid does not cause an error, but once the grid is paged in reverse, the following JavaScript error occurs: failed to mount: Unknown stub sSuPu1.

This fails on both firefox, 13.0.1 and IE 9.

The attached code illustrates the problem. You can copy/paste the following in the sandbox to reproduce the issue.