I have this problem with my RadGrid. One of the columns contains a template and therefore a FormTemplate is defined. A strange think happened as every row that has an alternate row style is now stretching over the grid edge. Has anyone seen this issue before?
In the above post you have mentioned that you are using a GridTemplateColumn. I am not sure whether this issue is caused due to a FormTemplate or EditItemTemplate of the GridTemplateColumn. It would be nice if yould could send your aspx code.