not sure why that would be happening, try this as a brute force fix:
add the following code to line one of the login page:
<?php
if(isset($_GET['accesscheck'])) unset($_GET['accesscheck']);
?>
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.