For the second bug, An example may help. I ran into (what I believe to be) the same bug a few months ago, but assumed it was a problem with the font rather than with st. (I had been making modifications to the font for a while and assumed I'd done something wrong.) I made a screenshot of the issue, which you can see here: http://ompldr.org/vYWljbA
I hope this helps a bit. If not, I'm sure I can recreate this issue quickly and debug or provide more information.
