Thanks for the response.
Looking at the console reminded me that I'm running the Dev release of ChromeOS which updated around the time that this problem started. That is probably the problem, either a new feature or a new bug rolling out in Chrome 73.0.3680.0. So you could just call it my own fault for playing with fire.
The Chrome 73 console is reporting:
waiting for connection with session id 959066
project-frame.js:123 connecting to https://recri.rstudio.cloud/6d955bab85a94d4e88ccb6153a87e68f/
VM20 jquery.min.js:2 [Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.
send @ VM20 jquery.min.js:2
ajax @ VM20 jquery.min.js:2
getSettings @ VM25 shinyapps.js:39
(anonymous) @ VM25 shinyapps.js:1
(index):75 Application not loaded. Retrying in 250ms
(index):75 Application not loaded. Retrying in 500ms
(index):75 Application not loaded. Retrying in 750ms
(index):75 Application not loaded. Retrying in 1000ms
(index):75 Application not loaded. Retrying in 1250ms
(index):75 Application loaded in 7361ms (5)
The Network pane shows that script fetch 29.cache.js has status (canceled), the fetch was initiated by VM32 rstudio-0.js:10102. The VM?? prefix changes between reloads.
I can create a new project, but it never opens. It shows up in the workspace listing as Untitled Project when I back out of the open.
I cannot volunteer to test the theory that it's Chrome 73.0.3680.0, because it would require a complete wipe of the chromebook to get back to a less bleeding edge release.