In march version (2.67.5404.581) I've experienced some strange behaviour with the release of the new modeling view in Power BI Desktop.
The most urgent issue is that some of the of the tables in the modeling view has been locked from resizing somehow. When trying to rezise these tables the UI is not responding. You can also graphically see that they have been bugged out looking at the table square. (see attached image).
Other then the above the new modeling view is a very much slower experience than before. With large models the tables sometimes freeze when dragging them around, and sometimes there's such a big input lag that it takes several seconds for the mouse input to be registered when for example selecting, resizing or moving tables.
The ability to resize the tables has also been changed. Currently it's only available dragging from the bottom right corner. This is a minor thing and mostly just annoying since it's a degradation of functionality since the earlier version. But please, take a look at this as well.
This is my third issue report regarding the new modeling view. Basically it feels that the new modeling view is in an unfinished state at the moment. There are some very nice new functionality, but there are some basic navigation/UX functionality that are missing compared with the earlier version.
EDIT: I just realized that the possibility to create relationships using drag and drop between tables is also missing in the new modeling view. This is also one of the features that existed in the old relationships view. Currently need to open "Manage relationships" view which is not as intiutive (at least not all the time).