All I did to make this update was take this code from the continue shopping server behavior:
if (true && isset($_SESSION['WAEC_ContinueRedirect'])) {
$Redirect_redirStr=siteToPageRel($_SESSION['WAEC_ContinueRedirect']);
}
and add it into the clear cart code. If you are having trouble getting my code to work you can just take from your own code, if your continue shopping button is working for you then this code should work the same.
If you continue to have any troubles with this post back with a copy of your cart display page and I can show you where and what update to make.