Cookies not working properly?

Hey folks, need some help.

I have webloginPE working real well on my site just now but the cookie session seems to stop working and it’s cracking me up! Basically I have a single option, a check box with "stay logged in" and it’s using the "rememberme" option that the docs say to use. Anyway, the cookie seems to work for 10 mins and if you’re inactive for say 10 mins, it’s ending the session. What would cause this? Could someone tell me how to set the cookies up correctly that I can have one single option that a user can select to stay logged in.

in FF the cookie info says the cookie will expire on 01 December 2013 11:26:42 so it should keep me logged in right? Well in IE, chrome and Safari, it’s not working. After a short period of time it’s signing me out and that’s just plain annoying lol.

This happened with other PCs so it’s not something to do with my own setup.

Any advice would be super. Thanks!