Could you confirm if you are running the examples in JupyterLab? You can use the JupyterLab interface by appending a ‘/lab’ at the end of your IP address, e.g. 192.168.2.99/lab. For the QPSK example in particular it’s recommended to run from JupyterLab, since the demo uses plotly FigureWidget which is known to sometimes have issues displaying in standard jupyter notebook.
Thanks
Shawn