@Mark thank you for the answer
I'm not able to look in the code, sorry. But when I look at the two pictures below, it's clear that v66 was able to display the background, the menu and the notifications as well as the window borders, and unable to display the content of the windows, "just" because there was a mismatch between the "display port" size and the "window" size. Lines are wrapped because the available pixel size doesn't match the used pixel size. Later versions of the code have the same problem for all what worked in v66 that is, not only the parts inside the windows, but also the background and borders of all the graphical objects.
BR
Pulsar33