Not unless my computer did it itself, since it was working fine just over a week ago and I haven't mucked around with any of the browser options (and on my iPhone too?)
(I've just added startrekonline.com to allow cookies and that hasn't made the slightest difference. Every time I close down IE or Firefox, it demands that I log back in the next time I open the browser).
Had that happen to me on a ecent windows update. What I had to do was go to the main site. Log in to my account(as if I wanted to change something in the account) selecting remember me before hitting enter. Then when I go to the forum It will remeber me.