So, this is odd. Notice the white when the cursor flashes, the change in background when text is added, and the other stuff.

https://skurfer.com/files/TextMate_Custom_Theme.mov

I thought it was an issue with light themes since it wasn’t happening with most files. (My default theme for most things is dark, but Markdown files use a light background and my default for new documents is Markdown.) Anyway, it appears to be theme-specific. I tried another light theme as my default for Markdown and didn’t see these problems.

The (unfinished) theme I’m using in the video is attached. Maybe there’s something wrong with the theme, but I’ve been using it for years. (Yes, and it’s still unfinished.)

Thanks.