Hi Rene, "Rene Gollent" <anevilyak@xxxxxxxxx> wrote: > Unfortunately it isn't...it works correctly in R5 though. How is the > owner set up in a freshly constructed window? I notice _InitData sets > it to B_ERROR, and also sets fCachedStack to 0, so unless something > else is happening in between that I'm missing, BLooper::check_lock > cannot possibly succeed. I've made it a bit less confusing in r24445; gLooperList.AddLooper() will also lock the looper. Bye, Axel.