If you have passwords for other apps stored in Keeper, it'll cause problems. Otherwise, turn it off and, if you have problems, turn it back on. (You shouldn't have any.)
If you want a password app you can use across multiple devices, and keep them all synced, I use KeePass Droid on my phone, with the password file on Dropbox, and DropSync to keep changes synced, and KeePass on my laptop and desktops, with the password file set to the Dropbox file. Add or change on one and they're all in sync (as long as they all have an internet connection).