[Q] Cannot set Locksreen PIN or Password anymore - Galaxy S II Q&A, Help & Troubleshooting

Hi
I cannot set a working Lockscreen PIN or Password anymore.
What happened, since yesterday my lockscreen PIN was not working anymore.
Im using the PIN now for several months so i'm for shure trying the right one.
I have to use at least a PIN or Password due to security requirements from a configured Exchange account.
Factory resetting did not help either. Was then able to connect with adb and delete /efs/cryptoprop*
This allowed me to use the phone, was also able to set a new PIN or Password but they won't work after locking the phone.
Did then format /system /efs /cache and reinstall, but even after all this as soon i configure a PIN this PIN won't work!
What was working was to set a new Paatern for unlock, but the Exchange account enforces PIN or Password.
Also the text is asking for an unlock password, but the screen shows the number keyboard, not shure if it was like this all the time.
Any idea waht could be wrong?

Did it stop working after you updated to ICS, by chance?

No i did not change anything. Installed checkrom v6 arround a week ago.

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