Hi John,
Sorry for the trouble you are experiencing. I just logged in, selected Elkorn Slough ok and I stayed logged in. Have you (or a system administrator) changed your browser's security settings since you last used the survey successfully? Maybe cookies have been disabled or something similar that is preventing you from staying logged in. Perhaps if you have a different browser you could try that first and see if it works. Please let me know what Platform, OS and browser versions you are using and if you now where to locate it, what the security settings are. Let me know if you need any help locating any of this information.
Cheers,
Adrian