I think I am having the same problem as .(JavaScript must be enabled to view this email address)
I was told to create a new post, so we don’t get things mixed up.
I was having the same login problem this morning. By chance, I deleted all my cookies last night, and this AM, I couldn’t log in.
I haven’t logged out in a long time, so the cookie for my site was probably very old, but I think I figured out that the recent change was when I added .myblog.com to the System Preferences -> Cookie Settings.
I think the problem I was having was that my EE files are located under a different domain than my blog.
I changed the cookie setting to the domain where the EE files are, and that worked. Then I removed the cookie setting all together, and that worked as well. But it does not allow login if I use my blog domain as the cookie setting.
I am wondering now, if it’s that important to use a cookie setting, or can I just leave it blank. Or if I use the other domain (not my blog domain) will it mess things up for my blog domain cookies.
Thanks!!!!