From the press I read that the German minister of foreign affairs stranded with an Airbus A340 in Abu Dhabi, because the flaps or slats would not correctly retract. To return to the airport they had to dump quite a lot of fuel first.
A German news article has a few details.
So what I read was that after the extra landing they had made a test flight, and everything worked OK. Again, there's a German article on that subject.
However when "fueled to the top" (I guess) again, the flaps or slats had a problem to retract again.
So I'd like to ask: What detail of the construction can prevent the flaps or slats to retract when the wing tanks (I guess that's the relevant part) are filled to the top?
Likewise: What's the role of the temperature, meaning: How much does cerosine expand when the temperature rises (like percent per degree Celsius)?
Could the expansion of the fuel be the problem?