Hi Vinod,
We are experiencing the same kind of problem. Your call dates from last year and unluckily no solution was posted since then.
We tried to change the file types (explorer--> option) of MXD and MXT back to ArcMap instead of ArcGIS FileHandler, but that does not seem to do the trick.
Have you found out a solution in the meanwhile?
I would be most grateful if you (or anyone else) could help.