We recently non-visually upgraded quite a few sites from 2007 to 2010. Now we are trying to add some customization to one of them by adding a data view web part to a web part zone in Designer. But when we check the page in with the DVWP and then check it out again, it strips the DVWP and all the customization out of the web part zone. Has anyone encountered this? We've tried it on different Developers machines and still get the same results. Thanks!