Hi, Adam D. Moss wrote: > Adam D. Moss wrote: > > COCO_DISABLE doesn't help > > I mis-tested - COCO_DISABLE makes the problem go away. >From jitdoc/coco_portability.html: Note for Windows: Please read the explanation for the default Thread Stack Size http://msdn.microsoft.com/library/en-us/dllproc/base/thread_stack_size in case you want to create large numbers of Fiber-based coroutines. Bye, Mike