Tracy styles override the background colour of pre elements in the front-end toolbar, but not the colour, which may result in invisible text. In my case pre elements are styled to have black background and white text, so here's what these look for me in the Tracy bar:
Thanks @teppokoivula - sorry, there are probably other things like this. Maybe there is a better way to override things like I am but this issue should be fixed in the latest version.
Tracy styles override the background colour of pre elements in the front-end toolbar, but not the colour, which may result in invisible text. In my case pre elements are styled to have black background and white text, so here's what these look for me in the Tracy bar: