no image for transcription

Clicking on any line in the transcription panel here (http://www.escriptorium.fr/document/30/part/9712/edit/) opens the transcription and the polygon overlay is shown but no image comes up. The image is not very big, ca. 2k x 2k. Also the transcription of the first line, seized in the textannotation panel is invisible in the transcription panel. If hovering over the first line area, the polygon is shown and if clicked the transcription modal with the correct seized transcription is shown. So the text is just invisible.