My iMac doesn't shutdown (except in a Bootcamp Partition like XP)

Hola amigos, el problema es el siguiente, hay muchas veces que intento apagar mi ordenador teniendo alguna que otra aplicación abierta, y se queda la pantalla azul, con la ruletita gris durante un tiempo indefinido, y la única forma de apagarlo es apagandolo del botón dejandolo pulsado durante unos segundos... Esto no pasa cuando cierro todas las aplicaciones a mano, y después apago, o cuando apago desde una partición de Bootcamp (Windows XP)
A qué puede ser debido ?, antes no me pasaba.
HI Friends!, here is my problem: sometimes, when i try to shutdown my iMac with some applications open, it stucks on the "Blue" Screen with the grey roulette for an infinite time... It doesn't go down, even it goes to the screensaver mode, and doesn't shutdown...
This doesn't happen if I manually close all aplications before shut it down, or if I try to shutdown in a Bootcamp partition (Windows XP for example), in the two case, the iMac shut down well :S
Why does this happen ?
Thankss and sorry for my bad english -.-

There are a couple things I can think of. First of all, are you using FileVault? This can cause a shutdown hang if it is enabled on your user account (personal experience). Try disabling filevault via the Security preference pane.
Another is to repair disk permissions. Open Disk Utility and click on your boot volume, then go to the First Aid tab and click "repair disk permissions". The third thing you can try is repairing the disk itself. Using your OS X install CD/DVD, start up and hold the C key until you see the installer. Click "Installer" then Disk Utility, then click your boot volume and then "Repair Disk" on the first aid tab.

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