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Afaik, apps who use google/facebook etc. to login will not work with a different signature (modify and reinstall).
But there's two ways to bypass this, which requires root:
- directly patch the app, all saved data (including login) will be kept
- Backup data with TitaniumBackup, reinstall modded app, restore data
Please note that not all applications can be modified successfully, some are protected against modifications and refuse to operate after they have been modified
As it says in the Lucky Patcher itself, you will be luckier with patching than with modifications, because during patching Lucky Patcher preserves the installed application and its existing data and so the chance of errors is extremely small.
Patching is highly recommended for users with root access, if you do not have root, note that not all applications can be or could be modified through Lucky Patcher successfully, since some apps are protected against modification, this is not a bug Lucky Patcher and can not be solved
I hope I have clarified your doubts
Cheers,
Snow Projects.