So i fixed the issue above. It happened to me because i had lent the phone to a friend (after deleting my data) and he (stupidly) formatted the partition mounted as /home/user/MyDocs (the fat32 part of internal memory).

So i did a backup of the phone with the included backup app (i cheked everything). Then i went to settings. From the menu i cleared all user data and reset to factory settings (restarting each time). Then i restored the backup.

Then it worked.