PyCharm 2020.3.3 won't render Jupyter Output

I'm having the same issue as https://intellij-support.jetbrains.com/hc/en-us/community/posts/360006850280-PyCharm-won-t-render-Jupyter-output 

It appeared suddenly, in a project that was working fine.

Markdown renders correctly, just Jupyter fails to render output.

I tried connecting to jupyter via browser, using the link in the event log, and all seems well in the browser.

Here is the event log, with the likely cause at the beginning.  Regrettably, i don't know react to chase this down more.

03/14/2020

20:12:21 Jupyter Javascript: Error: Minified React error #200; visit https://reactjs.org/docs/error-decoder.html?invariant=200 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. 

20:12:54 Jupyter Server started at http://localhost:8888

Open in Browser

20:31:16 Jupyter Server stopped



The error message at the end of the react error link boils down to:

The full text of the error you just encountered is:

Target container is not a DOM element.

I also tried after rebooting my mac book pro, and got the same thing.

Details of my installation:

PyCharm 2019.3.3 (Professional Edition)
Build #PY-193.6494.30, built on February 6, 2020
Licensed to <redacted>
Subscription is active until June 1, 2020
Runtime version: 11.0.5+10-b520.38 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.14.6
GC: ParNew, ConcurrentMarkSweep
Memory: 1981M
Cores: 8
Registry:
Non-Bundled Plugins:

Thanks in advance for any help you can provide!