Indeed, I can reproduce, and have verified the bug is triggered by the update of python-pil (in my case, from 2.9.0-1+b1 to 3.1.1-1+b1).
It is more than probable that this reflects the same problem as https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=806976 since fontypython uses "tostring()" at lines 413 and 414 of fontypythonmodules/gui_Fitmap.py My guess is also that this should not be hard to fix... will try to give a look in the next couple of weeks. Kartik, do you think we should also ask a "Breaks" on python-pil (as currently happens for rapid-photo-downloader and tilestache)? Pietro