Awesome, glad this one wasn't just me! Again, this problem also seemed to clear up int 5.20, so maybe its been fixed? Or at least masked a bit better :P

That MCE sounds really intriguing. In the full scale version of my code I make use of Thread::Queue and a pool threads (as you have taught me over the years), in your experience how large are the performance/reliability benefits of using MCE over such a model? Thanks!