Hi, you could consider to use the ASP.NET Response.Cookies and Request.Cookies instead of the CookieHelper. (that what I did in previous projects)
For more information see ASP cookies on W3Schools or ASP.NET Cookies Overview on MSDN
But as you can see on DevNet the CookieHelper should also work.
If you still have problems, can you then show your code and give an exact example of what is going wrong so we have more detail to investigate the problem.
If this answer helped you, please vote for my answer :-)