[Samsung Galaxy Gio GT-S5660] :
Yep, understood :)

Waiting for OldDroid. Otherwise, I'll do some tests, this evening! :)

----- EDIT #1:

Logcat important errors:

W/PackageManager( 3138): Unknown permission com.google.android.googleapps.permission.GOOGLE_AUTH.cp in package com.android.providers.contacts
W/PackageManager( 3138): Unknown permission com.google.android.googleapps.permission.GOOGLE_AUTH.mail in package com.android.contacts
W/PackageManager( 3138): Unknown permission android.permission.ADD_SYSTEM_SERVICE in package com.android.phone
W/PackageManager( 3138): Unknown permission com.google.android.googleapps.permission.GOOGLE_AUTH in package com.android.providers.calendar
W/PackageManager( 3138): Unknown permission com.google.android.googleapps.permission.GOOGLE_AUTH.cl in package com.android.providers.calendar
W/PackageManager( 3138): Unknown permission com.google.android.googleapps.permission.ACCESS_GOOGLE_PASSWORD in package com.android.development
W/PackageManager( 3138): Unknown permission com.google.android.googleapps.permission.GOOGLE_AUTH in package com.android.development
W/PackageManager( 3138): Unknown permission com.google.android.googleapps.permission.GOOGLE_AUTH.ALL_SERVICES in package com.android.development
W/PackageManager( 3138): Unknown permission com.google.android.googleapps.permission.GOOGLE_AUTH.YouTubeUser in package com.android.development
W/PackageManager( 3138): Unknown permission com.google.android.googleapps.permission.GOOGLE_AUTH.mail in package com.android.calendar
W/PackageManager( 3138): Not granting permission android.permission.SEND_DOWNLOAD_COMPLETED_INTENTS to package com.android.browser (protectionLevel=2 flags=0x9be45)
W/PackageManager( 3138): Not granting permission android.permission.DEVICE_POWER to package com.android.deskclock (protectionLevel=2 flags=0x8be45)

W/StatusBarManager( 3138): warning: no STATUS_BAR_SERVICE

W/InputManagerService( 3138): Couldn't create dir.: /data/system/inputmethod

W/RecognitionManagerService( 3138): no available voice recognition services found

W/ThrottleService( 3138): unable to find stats for iface pdp0

W/ActivityManager( 3138): Unable to start service Intent { act=com.android.ussd.IExtendedNetworkService }: not found

I/ActivityThread( 3264): Removing dead content provider: settings
I/ActivityThread( 3332): Removing dead content provider: settings
I/ActivityThread( 3251): Removing dead content provider: settings
I/ActivityThread( 3203): Removing dead content provider: settings

W/PackageParser( 3402): No actions in intent filter at /system/app/Bluetooth.apk Binary XML file line #125
W/PackageParser( 3402): No actions in intent filter at /system/app/Contacts.apk Binary XML file line #525
W/PackageManager( 3402): Package com.android.gallery3d desires unavailable shared library com.google.android.media.effects; ignoring!

----- EDIT #2:

I compared AOSP updater-script with CM9's one.

About permissions, they're the same. For on /system/app, no permissions configuration, but CM9 hasn't that kind of problems. So, not giving permissions should be like this: rw-r--r-- [Check attachment]

The owner (administrator, system) could do everything on apps, except for executing them.

Could it be the problem? Maybe, but in this case, also CM9 should not boot. Suggestion?