Edit: Well, now I know it has to do with the LJ cut, under which the pictures are frozen. So, for the time being I will post without the cut. *rolls eyes* Great job, LJ!
Another edit: This is what LJ says: Image resizing options are not working properly in RTE. (LJSV-1726) So until thery fixed another uncalled 'improvement' i won't use the LJ cut.