Material Graph doesn’t refresh properly anymore. If you preview a node then un-preview it, preview text is still left behind. You have to create a new node to fix it.
Also when you created parameters in all previous engine versions, focus would be shifted to Text box which allows you to edit name of parameter, now you have to explicitly move mouse there to click on it, which slows workflow down a lot.
There are a few issues in Graph at moment… what’s changed :/?