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To all: my workaround for the login problem that seems to re-occurr is first to login to be sure you are really logged in, then go to a different page you want to go to (forum, gallery, whatever). Each time your login is forgotten by the system (you can see that because your avatar top right of the screen disappears) do a refresh of the page and the avatar (and so your login) reappears and you can go on. I hope it helps.
Ramona, I would have thought myself it was a fallstreak hole you spotted, but the analysis by your friend is quite decisive and clever (unfortunately for you). I am sure you can do your dance later this year when you keep looking for altocumulus. When there are also planes in the neighborhood you soon will dance. Good luck!