Advance Poll 2.0.3 textfile - Admin Login loop

I've found several answers to this problem for the MySQL version, but not for us poor flat-packers who are running sites on the cheap.

I've got a loop when it comes to the admin login; even when I'm so sure that the password is correct, mainly because it was simple. I've tried a few things, from copying over the provided encrypted string in a file in the includes directory to reinstalling the entire bloody thing. Even then the same loop happens.

Is this a cookie problem? Or do I have to tinker with some htaccess files?

Any help would be greatly appreciated

JellyHead

ps many thanks to Auron for his install guide which originally got the poll up and running until the login went screwy