Before I begin, I am aware of other reports of this issue on this forum. I have looked at them and they all seem to have been in multi-player. I have also heard that removing empty jukeboxes are linked with issues of this nature. The following....um.....essay...outlines my problems briefly(ish).

I am currently running Minecraft 1.5.2 through OpenJDK Runtime 7 on Ubuntu 13.04 (amd64). A long time ago, I created a world on my laptop. When I got my new desktop, I transferred the world onto it and continued to work on it there. Recently, I transferred a world from my desktop computer, running on the same platform, back onto my laptop because I was going away. When I started the world, I found, to my horror, that most of my house was missing and the chunk had regenerated. I had a copy saved from a few months ago, so I looked inside my house and there were no jukeboxes or other such things inside.

This also happened when I updated from 1.4.7 to 1.5, in the same place, before transferring it onto my desktop computer. This bug has not affected any of my other worlds. I have the non-broken world on my computer at home, but I fear that this issue may occur when I next update the game or transfer a world.

As far as multi-player is concerned, I have hosted a LAN server a couple of times but never used it on a proper server. After checking the logs, there were no crash reports or any clues whatsoever as to the source of the problem and the game has not crashed whilst using this world. I have, in the past, tried to install mods, but it didn't work (different kettle of worms).

As it stands, I am running the current 1.6 development version (13w21a) on my home computer, alongside 1.5.2. I have a working copy saved, which was the copy I transferred. There was no problem with using the development version-edited world on the current version on my desktop, but this suddenly happened on my laptop. There have been no problems so far, but I don't want to have to rebuild it a second time.

In the hope that I have not bored you stupid, please could someone shed some light on the issue?

Thanks.