%matplotlib qt ,, ValueError: bottom cannot be >= top

Hello, a possible way to fix this is by resetting your MNE configuration. By default, MNE retains the size of your plotting window; if you delete the configuration file, the setting will be gone too, hopefully fixing your issue. You can find out where the config file is located by running:

import mne

print(mne.get_config_path())

If you then remove this file and restart Python / MNE-Python, all should be back to normal.