Tango backtrace hack is not working

Hello folks!
I was quite busy lately - exams and some of vacation and top secret stuff, but now I'm back.
First news I have for you isn't unfortunately cool - for some reason tango backtrace hack isn't working. we are currently trying to diagnose the problem but it may be not that easy. At the moment we even can't tell after which tango revision / dmd update something borked, we will appreciate all the feedback you have on this subject.