Peculiar problem with saving V5 data

I am facing a peculiar problem while saving V5 data in my server(this is a very huge server with tons of storage space). When I hit save, I get the save window showing that the save is in progress and it also shows that save is completed 100%. To my horror, I don't find the saved file in server.(I check the timestamp).
If I "save as" with a new name only, the file saves in server.

Only solution I found was to save the file in local disk.
And later move it to server.
With saving in local disk, there was no problem.
But really can't understand why I couldnt save it in sever!!

There is no problem with my server as other users can save files in it without any problem(not the V5 files though)..

Any thoughts???

Thanks

Arun