Here via flourish. I run lightning_war and have over 100 accounts. This mistake is easy to make, and does not make you a stupid head; however, if you use the firefox browser, check out ljlogin and try the LJ login extension. This add-on makes it possible for you to change which LJ, IJ (LW is now on IJ) or GJ you're signed into with a single click, then (if you tick that box in preferences) reloads the page for you. :)
It also displays which account you're signed in as in the status bar, so I can for example look there and see, right now, that I'm signed into both LJ and IJ as ataniell93--or, if I'm about to comment on a post, to see that I'm signed in as luxserpentis, who is AU Lucius Malfoy at age 11 and might not have an opinion on the latest election results (or at least one worth hearing).
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It also displays which account you're signed in as in the status bar, so I can for example look there and see, right now, that I'm signed into both LJ and IJ as