It comes every now and again before, that one has the problem with Magento, that the cart after the user has logged in the user account is suddenly empty. There are other similar incidents, you can possibly fix this little tweak:
In the backend system under > Configuration > Web and go there then at “Session cookie management” Cookie path “/” Enter and including your own domain. This has often helped.
If you have seen the problem before more accurate, you could see again and again, that a session / a cookie for “www.” Domain and “.” domain received. And this led to problems from time to time.
Update vom 15.11.2017
A problem, which had just occurred in this context, that only Chrome users logged out of the application immediately / have been signed out if you clicked on a link. For Firefox and IE there were no problems.
The problem was likely to continue in connection with the conversion of the entire page on SSL / https.
After adjusting the setting as described above (except for the slashes in the field “cookie path”, this was omitted), then flipped it back and problem.
A similar theme is also available HERE.
Used in Magento Version 1.9 Comments? Additions? Notes? Gladly!