I added the 3D-viewer node to a model i've been working on and then i wanted to deletet it but i conuld not, neither with delete key or from the edit menu? Used Firefox and saved the model, tried open the model in Chrome but got an error saying "TypeError: Cannot read property 'outputs' of null", model loads but whole node tree are gone. Tried open it in Firefox again and got a simillar error.

Thank god for revisions so I could open an older rev and continue...

Tried anoter new model with just one part and added a short rotation animation to it and added the 3d-viewer to the node tree and again I could not delete it, I just added it and didn't connect it to anything? Also in Firefox.