I’d been using export_png in jupyter notebooks with no problem, and with no need to import any chromedriver functions.
To solve a chromedriver issue unrelated to anything with bokeh I started to use this solution in other jupyter notebooks:
from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from webdriver_manager.chrome import ChromeDriverManager
from selenium.webdriver.common.by import By
driver_manager = ChromeDriverManager()
chrome_service = Service(driver_manager.install())
driver = webdriver.Chrome(service=chrome_service)
But it seems that now having installed webdriver manager, export_png is no longer working.
Any ideas what has happened? Thanks.