Reseting Chunks

[Devikat]

Ok, heres the rundown.

Me and my friends just upgraded our personal multiplayer server to 1.3.2 and carried the world over. everything was as normal until we noticed little things out of place. One persons stairwell and 'secret entrance' was gone and filled in as if it never existed and a rail system we sent to another players base several hundred metres away just stopped before his base...which no longer existed anymore.

I'm pretty sure that the stairwell was located in a seperate chunk to the rest of the base and the rail base took up almost entire chunk on its own.

Is there a known issue where far away chunks reset for no reason?

I should mention that the rail base had a world anchor which is still running and shows up in the server output.

Any help would be appreciated.

[Devikat]

Solved it, Server was not properly migrated to newest version and the world files were corrupted. luckily we have backups and it has *touch wood* been migrated correctly.