I just built an installer from the current Master and tried to load MITK scenes that my medical partners created. They should contain: a T1 image, a T2 image and various segmentations. While the 2018.04 release opens the file correctly, the current master just shows the T2 image.
An example scene is located here: E132-Projekte\temp_data\MITK_scene_bug
Was there any chages made to the dataloading?