Fuse Mesh Zone not Saving / Reopening in Case and data
 

I fuse zones in my mesh and run simulation. All works well, I am able to place points and to get reports and all works well.

But when I save the case and data, and reopen, the fused zones still remain fused but their naming goes, the simulation works but does not report any data on any fused surface or points, it shows error. It even shows error on placing any new point or surface to get the result

I have tried this on Fluent 14, 15 and 16

Any similar experience or resolution?