What are correct file permissions?

My phone is a Sony Ericsson Xperia X8, and I'm using CyanogenMod. There is an app called ROM Manager included in CyanogenMod, and I found an option 'Fix permission' there. I shouldn't have used this: I had no problems before but I have some now. During the fixing process I got a lot Force close dialogs, and after next reboot the phone had reset to the *default* CyanogenMod home screen configuration, *default* options for many programs, and *default* network parameter. I also got some more Force close dialogs. I have a backup done a week ago, but I really installed a lot during the week, so I don't want to lose it all. I hope there's a way to recover current situation. I tried this through adb shell: chmod -R 755 /data/data chmod -R 744 /system/app but it didn't help. I even tried this stupid idea: chmod -R 777 / but it made even worse: after reboot, my phone forgot even my Google account and offered to reconfigure it as if it was the first time I switch the phone after buying it. Can somebody tell me which file/directory permissions could ROM Manager change and how should I restore them to make everything work? Currently I have a backup made immediately after I discovered the problem. **UPDATE:** This fix_permissions.sh didn't work for me.