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What is "Check Login on Activate" in my Android App settings?
When the LastPass app is brought to the foreground (after you've been using other apps), this option forces the app check to see if the session has been killed on the server .. if so, LastPass will logoff. This forces you to login again, and forces an update from the server. This is a very useful feature for users who often kill their sessions via the server, or are concerned about losing their phone or mobile device.