It turned out that if I load the file holding the segmentation alone and the right click -> convert to segmentation, everything works as expected. Only if I load the raw image plus the corresponding segmentation simultaneously (which is my usual workflow), the bug above arises.

Alright, thanks!

I think @kislinsk suggestion would cover most use cases since the plane you work in is usually the one that is maximized. In this cases the working window will be the one that was clicked the last time.

Alright, thanks for your support!

Sorry I did not mention this, but I use the multi label segmentation.

Thank you for your extensive response.

Problem solved. The wrong version was picked. Sorry for the trouble and thanks for pointing that out!

When I close the segmentation view before I remove the files from the Data Manager, the workstation does not crash

no unfortunately not. A guy from the radiology department asked and he claimed that he downloaded the 2018-04 release. I'll ask him again

great, thank you!

As briefly discussed in the hall way:
I load two files into the object manager. One file is the MR image, the other file holds the segmentation for the MR image. The file holding the segmentation is then converted into a segmentation (right click -> convert to segmentation). This leaves me with 3 files in the data manager.