I think that I found some kind of bug with the SimpleMarkerOverlay.... I had issue with markers not showing up on the map when using this SimpleMarkerOverlay and I found that just adding inside the view CustomeOverlays the definition for an InMemoryMarkerOverlay just before my "smo" make my "smo" to work!!!!!
The attached demo is created following the requirements you mentioned, but seems lke it also works fine. So, could you have a look or modify some codes based on it?
Thanks for your further information, we recreated the problem and fixed this bug, would you please get the latest version 6.0.325.0 or 6.0.0.325 and have another try?
I tried again this morning with the build 6.0.324 and the issue is still alive. overlays.SimpleMarkerOverlay server to client synchronization does not occur or at least I cannot see it looking at the chrome network javascript debugging console. moreover just to confirm the other post the drag marker feature of the very same overlays.SimpleMarkerOverlay does not work as well even when a overlays.InMemoryMarkerOverlay has been defined insid e the same razor view.
This issue is caused by some javascript bug, so we did some changes on within javascript, I think maybe the reason is that js not refresh(update) in your side, could you please try to force refresh the webpage after you replace the newest dll and have another try?
I have downloaded the version 6.0.0.325 production daily build and the overlays.SimpleMarkerOverlay client to server synchronization seems to be solved but the DRAG MARKER option is still not working!