After the caching has finished,  the app constantly does this every 2 seconds.  I haven't opened anything or moved the window.  I simply start the app.

Do you have 0.3.2 available for download somewhere?

Hello there, thanks for the report, I will investigate further what is going on.

Meanwhile, I made available the 0.3.2 version here: https://galloscript.itch.io/texgraph