Hi,
Not sure if this has happened to anyone else, but it seems that using VS 2012 is causing some strange issues. Opening a file through Unity causes what seems to be some environment settings to be changed: line numbers disappear and the tabs become much bigger, as well as some indenting functions being broken. This can be worked around by resetting the environment settings and re-importing a back up, but this is hardly a fix.
Thanks for any help.