Timestamps are also a big deal with SVN as from what I remember SVN tends to mess up the timestamps of when the asset was last modified. So if your SVN is modifying the line endings to match the platform, that will mess up the hash calculation and make it think the asset has changed and thus need a rebuild. Unity uses unix line endings when it writes out any text files, regardless of platform. This will definitely cause the asset hash to be different in certain cases. Make sure your SVN does not modify the line endings of any text files on checkout. Click to expand.Ok, so the svn stands out as a possible source of the problem:
