My customer has this error that has started recently. He's recently upgraded to Weblink 9 and it worked fine for a few days then we are seeing this error. If we click Back to Welcome Page the Weblink session works properly at that point. It seems that all clients are getting this behavior.
Weblink displaying "Cookies are not enabled for this website. Cookies must be enabled in order to sign in to Weblink 9" error message.
Are the clients using any particular URL to get to WebLink? It's possible to get the cookies error despite cookies being enabled, if the URL contains the parameter cr=1. That parameter tells WebLink to check for a cookie it has already sent the browser -- but if the original URL contains that string, WL doesn't get a chance to send the cookie before checking for it.