The TextBlock doesn't seem to handle carriage return properly (\r, ASCII 13): it's displayed as '?'. The font doesn't seem to matter. \n alone works fine, but \r\n is common on Windows. It's a little cumbersome to have to "sanitize" the text before binding to a TextBlock.

I'm currently a trial user, so I can't open an issue directly. I'm using Noesis v1.2.5f6 under Unity 5.2.2f1.

Keep up the good work with the awesome product that Noesis is

Ok, I was able to reproduce it.
I have added this issue to be resolved for the next release.
Thanks for reporting.