Not sure if this is a bug or one for idea pond but using: 12.12.0.39 32 bit when I compare 2 files the the top left and right windows are not showing the underline character in the source code. Quite unnerving if you have spent a lifetime coding with underline characters?
cant see an option in the options
thoughts?
Will you post a screen shot?
I think the problem is your font. This is how it looks for me. I circled a few underscores. It is still hard to see them on the selected line, but on the non-selected lines, they are easy to see.
Ok I was under the impression I was using a default font. I will try the font options.
I had the same issue, and it appears that if you change the font SIZE to be larger, when you reach a certain point, the lines bleed into each other. I was able to get the underscores to appear with a fontsize of 10, but when I switched to 11 or higher, they vanish. And when i tried a fontsize=16, the lines step on each other.
You can see what happens when i went from 10 to 16. I believe with fontsize=12, the overlap was just enough to make the underscores appear to vanish.
Size 10 is rather small for older eyes 
it would be nice to get this fixed so we can increase font size without losing any visibility.
Fixed for next beta.
