New session on every reload

Check your storage folder permissions.

Im running Windows, and there are files in 'storage\framework\sessions'

Do you have some code to show where you created a session, or is this happening only fresh install without you doing anything else? Are you getting any error messages, try to give more information please. Make sure you have the latest version installed.

Fresh install. Laravel 4.2 works fine, but 5.1 (installed through laravel and composer) loses session on every refresh. And no errors.

Check your env file / config files and look at laracasts.com/discuss/channels/laravel/sessions-are-not-persisting-between-sessions see if it helps.

Actually, it's normal secure behavior. You can check it in chrome debugbar here at laracasts.com or even laravel.com.

Refresh page and see result

Or if you do mean real session id get through, say, Session::getId() then you have to check config/session.php file. Probably domain or path settings could be wrong

Ok, then why in my app i randomly get logged out? I log in, I refresh few times and boom - logged out. :(

Edit: Reboot somehow fixed this XD