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If you're using Windows XP, you will need administrator rights or else it will have to hash your files every time Shareaza is started.
When you move your files, Shareaza will have to recalculate hashes for those files.
Using Windows Media Player 9 can change your hashes with its Smart Jukebox organization. WMP9 will add missing fields for ID3 tags when possible, which changes the mp3's hash. It is recommended that you turn this feature off in WMP9 through the program's options.
It is possible that through a time change, your library will completely rehash. It is unknown why this may occur but most likely it is due to the file system in use.