Matplotlib Plugin 2023.0.1 includes changes to the code to prepare for Indigo v2023.2.
Users who expect to update to Indigo v2023.2 should download and install this plugin release BEFORE updating Indigo. Otherwise, you'll be greeted with a sea of red in the Events log. These changes are necessary to accommodate changes to the Mataplotlib library and not due to Indigo. This release also has a fair number of code refinements under the hood.
UPDATE -- Users of Indigo v2023.1 are safe to update -- and should update before moving to v2023.2.