@isensee What exactly does not work?

• Are you not able to load the data / ML nodes in the utilities selection widgets? That is a known bug and is addressed here: T28135
• Are you not able to work with multiple labels at all? This is also a known problem, since the MultiLabel Utilities View was never correctly implemented for working with multiple labels.

Sorry but you probably have to wait - we are working heavily on the (ML) Segmentation redundancy and will probably come up with something more efficient, incorporating a new design for the MultiLabel Segmentations to flawlessly work with multiple labels.

However, I was able to presumably do what you wanted to do, see screenshots. This was a complex process and handcrafted solution but just to show if we are generally able to do what you want to do:
Before adding:

After adding:

Before removing:

After removing:

@isensee Could you give some information regarding the question (see comment above) . Thanks.

@isensee Ping!

Just had a talk with @kalali :

• yes loading is a problem, I don't know whether that was also a problem back then. The multilabel segmentation utilities does not allow to select multilabel images
• the main problem still persists: I cannot select a layer and a label that I want to modify with the plugin (this selection needs to be possible for all selected label images). In this particular case I wanted to add a small fraction of label_image_2_layer1_label1 to label_image_1_layer1_label1 using the 'union' tool

@kalali told me that adding this functionality seems to be already on your (Stefans?) todo list, so everything is great :-)
From my side there is absolutely no time pressure to solve this as we were able to run the required steps with a simple python script instead