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This happens only in HTML-mode, not in Visual mode. Seems like an error with the editor.

No. I use the link Button in the new article box, enter the url in the appropriate box etc.

Same here.
Just hoping that i’ll be abe to access the admin panel tomorrow …

I dectivated use slideshow, that seemed to have solved the problem now.

Just did some more testing, it works perfectly with IE 9.0.8.112 whereas with Firefox 9.0.1 the iamges still seem obstructed.

It works. At least sort of.
I find that it depends on where the gallery image is located in reference to the header image, meaning that the first gallery image is liekely to be obstructed at the top while an image located farther down will not be obstructed.
Is that just me?