When I start fresh RStudio and run a Shiny app, it works correctly in a pop-up window. However, after closing and opening the app a few times the pop-up window is greyed out and I can only run the app if I click "Open in browser". The problem persists until I restart RStudio. It started happening after 2022.12.0 update.
Some other people reported it on Stack Overflow, so I'm not alone with this. Could not find this issue here, but perhaps it is a question of wording.
Using RStudio 2022.12.0 build 353 on Mac OS Ventura 13.1. Shiny 1.7.4, R 4.2.2.