Hi, I'm a newbie so please be forbearing when I have made wrong assumptions. I have attached two simple test programs simple.cc and simple1.cc to illustrate the (presumable) bugs. I currently use VC 7.1 and Boost 1.32.0 on WinXP. The access violation in simple.cc (when built with NDEBUG) occurs when I try to emit a signal without slots. Documentation seems to state that in this case the return value of the emission is undefined, which seems to imply that the actual call should work (which it should anyway, IMHO). When I compile with _DEBUG defined I get the following assertion thrown at me: <assertion> Assertion failed: first != last, file boost/boost/last_value.hpp, line 23 </assertion> simple1.cc shows a very basic slot leakage, you will see 9 constructor calls but only 8 destructor calls for the handler. This could be caused by having pos.impl_->group->second.erase(pos.impl_->slot_); commented out in named_slot_map.cpp:230. The half bug I mentioned in the subject is the one which I am least sure about. simple1.cc shows that my callback functor is copied eight times during connect (that obviously implies seven destructor calls). Isn't that a performance issue? TIA, aa -- Andreas Ames | Programmer | Comergo GmbH | Voice: +49 69 7505 3213 | andreas . ames AT comergo . com