most of the time this is user error: 1) cookies are disabled in the browser you are using, or 2) you are accessing the manager with an incorrect URL.
try accessing the store manager area using atleast two "." in the URL. For example, instead of using: http://yourname.com/protected/manager.cgi instead try using http://www.yourname.com/protected/manager.cgi. This will solve most problems assuming you have the setup the Store URLs in the manager areas previously and your cookies are already enabled in your browser (most are by default).
in the newer versions you can use the password manager to disable the "use manager cookies" setting by changing it to no inthe pasword manager. All this means is that two simultaneous logins cannot be done into the stoe manager areas. Older versions need to open the manager.cgi file in a text editor and set the "use manager cookies variable" to no.
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